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TOPIC: Electrical Wiring schematic for new engine....

Electrical Wiring schematic for new engine.... 17 Mar 2015 21:58 #1

  • mmetzger1028
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So its getting close to the time to drop my engine in and I wanted to be very clear on how I was supposed to be wring this thing up. I thought I had a good idea of what to do, but the more I researched the more my head started to spin lol. However my engine is already wired so the engine harness part is done. Just not sure how to hook the engine up to my boat/batteries properly. Anyone have a schematic drawing to help this make sense to me??

The engine is a newer EFI Volvo 5.7 with harness
The boat was wired with an older Volvo Penta 5.7

I guess lets start with the batteries and all the wires that need to be connected directly to them.
- Starter Solenoid
- Bilge Pump (with float switch)
- Cabin Power?

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1979 SunRunner 245 Flybridge
1997 Volvo Penta 5.7Gi
Volvo Penta 280 outdrive

Electrical Wiring schematic for new engine.... 17 Mar 2015 22:28 #2

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Is this accurate? Recommended?
What is the flow of electricity back to the batteries when charging? Through the starter solenoid?

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1979 SunRunner 245 Flybridge
1997 Volvo Penta 5.7Gi
Volvo Penta 280 outdrive

Electrical Wiring schematic for new engine.... 17 Mar 2015 23:16 #3

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This should be the wiring diagram for your engine VP 5.7 GI

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orange wire from the alternator
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Electrical Wiring schematic for new engine.... 18 Mar 2015 00:02 #4

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Thanks so much! Is there a HIGH RES version of this somewhere so I can print it out and have all the fine print readable as well??

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1979 SunRunner 245 Flybridge
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Electrical Wiring schematic for new engine.... 18 Mar 2015 01:05 #5

  • Shawnh
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I just clicked on the photo above of the wiring diagram and came up with this... Not sure it is good enough, but it looks pretty good...

s1324.photobucket.com/user/juniinc/media...zpsvmn7rtah.jpg.html

With the zoom feature in Photobucket, (the + sign in the upper right corner of the photo) it should get to a nice photo for you to look at.

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Electrical Wiring schematic for new engine.... 18 Mar 2015 01:08 #6

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mmetzger1028 wrote: Is this accurate? Recommended?
What is the flow of electricity back to the batteries when charging? Through the starter solenoid?

Charging from ALT. Will charge selected battery through the MBSS (BATT1, BATT2, or both). AC powered battery charger should connect to batteries VIA the #1, and #2 terminals of the MBSS. Aassuming you have a charger that can charge multiple battery banks. Power your bilge pump from #2 (usually house bank) terminal also. ;)

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Dave
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.030 over-Vortec top end-part closed cooled
***The rebuild of my 2556***
www.baylinerownersclub.org/index.php/for...ansom-repair-my-2556

Electrical Wiring schematic for new engine.... 18 Mar 2015 01:50 #7

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Dumb question, but what is " MBSS "

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1979 SunRunner 245 Flybridge
1997 Volvo Penta 5.7Gi
Volvo Penta 280 outdrive

Electrical Wiring schematic for new engine.... 18 Mar 2015 01:53 #8

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Only dumb question is the one ya don't ask :)

Master battery selector switch.

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Dave
Edmonds, WA
"THE FIX"
'93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
.030 over-Vortec top end-part closed cooled
***The rebuild of my 2556***
www.baylinerownersclub.org/index.php/for...ansom-repair-my-2556

Electrical Wiring schematic for new engine.... 18 Mar 2015 02:04 #9

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MBSS = Main Battery Selector Switch.
I'd steer clear of the Perko 90* sweep MBSS. The contacts are small, and the contact spring tension is rather weak.
Perko on left............................ old Cole Hersee on the right.






Mike, which engine harness are you planning to use?
The AQ260 harness, or the 5.7 GI harness?
I think that you may complicate things if you were to use the GI harness and interface it with the OEM hull harness.

Here's a very simple yet well laid out battery bank scenario for a smaller single engine boat.








Here are some icons if you want to draft up your own schematic.


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Rick E. Portland, Oregon
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Electrical Wiring schematic for new engine.... 18 Mar 2015 02:05 #10

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mmetzger1028 wrote: Thanks so much! Is there a HIGH RES version of this somewhere so I can print it out and have all the fine print readable as well??


No problem!
I have the HR version, but IDK if it's any better than my Photobucket version ;) if needed I can send it to you.

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Electrical Wiring schematic for new engine.... 18 Mar 2015 09:12 #11

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Ruffryder wrote:

mmetzger1028 wrote: Thanks so much! Is there a HIGH RES version of this somewhere so I can print it out and have all the fine print readable as well??


No problem!
I have the HR version, but IDK if it's any better than my Photobucket version ;) if needed I can send it to you.


Mostly wanting to see a clear shot of the harness connector and the color code for the wires......

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1979 SunRunner 245 Flybridge
1997 Volvo Penta 5.7Gi
Volvo Penta 280 outdrive

Electrical Wiring schematic for new engine.... 18 Mar 2015 09:34 #12

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Electrical Wiring schematic for new engine.... 18 Mar 2015 17:54 #13

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I think for the initial hooking hooking up of the engine in order to
A) get it started
B) Make sure all the wiring is connected to the proper gauge etc

I will just temporarily use these Bullet Connectors. Then once all is well I can tie everything in properly.

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Volvo Penta 280 outdrive

Electrical Wiring schematic for new engine.... 18 Mar 2015 21:05 #14

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So here is where I am currently at. As you can see I need some help figuring out how to hook up some of the wires. Ideas?


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Electrical Wiring schematic for new engine.... 18 Mar 2015 21:29 #15

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New engine color code
2 grey- tach
4 tan/black-alarm( - )
5 purple-ignition
6 red/purple-instrument( + )

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Electrical Wiring schematic for new engine.... 18 Mar 2015 21:41 #16

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So my boats harness has two wires designated for the coil a (-) and a (+) How would I wire that into the engines harness? Its confusing as hell lol

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1979 SunRunner 245 Flybridge
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Electrical Wiring schematic for new engine.... 18 Mar 2015 22:54 #17

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that's the Mercruiser diagram you posted! Not for your VP....
New engine 5.7 GI is 10 prong, old hull hardness should be 9 prong,
On your #2 Existing boat hardness, you do not have purple1 and purple2!
You only have one purple which is the ignition + circuit #5
Purple 2 you're thinking of is RED/PURPLE...this actually feeds all your instrument POWER(50amp fused)

#6 Red/Pur Dash +
#7 Yel/Red Starter"S"

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Electrical Wiring schematic for new engine.... 19 Mar 2015 02:02 #18

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Lets make it simple,

What needs to be hooked to what to at least get the engine to start/run. Then I should be able to figure the rest out via trial and error right?

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Electrical Wiring schematic for new engine.... 19 Mar 2015 12:57 #19

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Mike, Volvo Penta has used this AQ131A (and others) engine/hull harness color scheme for many engine models during your boat's year range.

The relay for the starter motor solenoid circuit is a good idea.
You may not need the start-by-pass circuit for the 5.7L GI engine ignition system.

You will want to use a relay for each fuel pump, and you will want to keep the N/O low oil pressure switch in the loop.
If you do create a start-by-pass circuit as to circumvent the N/O low oil pressure switch during start-up, make sure that it cannot back-feed in any direction.
A momentary helm switch will work also.... but it must be a momentary switch!

Your older hull will be using Black for all Negatives.
Your later 5.7L GI may be using Yellow for all Negatives.


I can't make sense out the AQ131A notations re; the N/O oil pressure switch diagram.

The relay power coming directly from the battery is a NO NO in my opinion.
(no need for any direct battery connections other than battery cables alone)
You can take power from the MBSS "Common" terminal for this, or if you need Un-Interrupted power, you can use the #1 or #2 terminals.... (fused of course!)


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Electrical Wiring schematic for new engine.... 19 Mar 2015 15:44 #20

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Mike, is your used 5.7GI complete?
If so, you should have all theses relays pre-wired already! I'll need to KNOW THIS.
As Rick said, relay power SHOULDN'T come directly from the battery!
There should be 10amp fused ignition/fuel circuit + 20amp fused fuel pump relay circuit & must be connected to the ECM since that is where the N/C oil pressure switch is tied into!
Like I said...hoping all these secondary wiring is there because it will save you a lot of work.
To get your engine going temporarily....
BLACK to BLACK ( battery -)
RED/PUR to RED/PUR (battery +)
PUR to PUR (ignition +, this will turn on ignition/fuel pump relays)
YEL/RED to YEL/RED. (starter relay)
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Electrical Wiring schematic for new engine.... 19 Mar 2015 16:11 #21

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Just took a glance at your diagram...
1 You need 1 more wire at the ignition switch(red/pur)
2 cab purple does not connect to engine purple & brown
3 cab grey does not connect to engine purple & white
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Electrical Wiring schematic for new engine.... 19 Mar 2015 17:24 #22

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"You will want to use a relay for each fuel pump, and you will want to keep the N/O low oil pressure switch in the loop.
If you do create a start-by-pass circuit as to circumvent the N/O low oil pressure switch during start-up, make sure that it cannot back-feed in any direction.
A momentary helm switch will work also.... but it must be a momentary switch!"

lol this may as well been in German for me haha, I need to do some homework on electrical "lingo" so I can break this all down and make sure I know the language.

RuffRyder: Yes, the engine is complete, ready to drop in. It already has the wiring harness already connected properly, I am just wanting to figure out how to properly connect it to my exciting boat wiring.

Here is the new engines harness already wired.



Here is the boars exciting harness.



And here is a clear pic of the boats exciting harness and 9 wires.



**Note** I kept the old harness for referencing, and fortunately the wires were labeled. Id attach a pic but they are at the boat. I wrote them down however so Ill post it here.
Black Negative
Red Battery
Orange Alternator
Red/Yellow "S" Terminal
Gray Ign. Coil (-)
Purple 1 Ign Coil (+)
Purple 2 Starter 1
Brown ???? No label :(
Lt. Blue Oil Pressure

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Last Edit: by mmetzger1028.

Electrical Wiring schematic for new engine.... 19 Mar 2015 17:30 #23

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Did you get my reply back?
OK GOOD! in that case, you only need 4 wires connected to get it going! Read my post #20
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Electrical Wiring schematic for new engine.... 19 Mar 2015 17:33 #24

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Good! Looks like you have all 3 breakers and relays there & already wired!

"You will want to use a relay for each fuel pump, and you will want to keep the N/O low oil pressure switch in the loop."
There should be 1 fuel pump relay serving BOTH fuel pumps!

*EDIT** Wait a minute, you have "RED/PUR to RED/PURPLE" however the boat harness has not RED/PUR wire, so do you mean the PUR1 "and" RED wire from the boat spliced into the single RED/PUR of the harness?

I see now where that purple 2 went to...connected to your old stater because it had a mechanical ignition! Anyhow your new starter doesn't need this purple2 wire so we can ignore it.

BLACK(NEW)TO BLACK (CAB): BATTERY -
RED/PURPLE(NEW) TO RED THICK(CAB):BATTERY +
PURPLE (NEW) TO PURPLE1(CAB): IGNITION +;PURPLE1(CAB)SHOULD BE CONNECTED TO IGNITION SW "I" TERMINAL.
YEL/RED (NEW) TO YEL/RED(CAB) : STARTER RELAY(NEW) IGNITION SW "S" TERMINAL(CABIN)
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Last Edit: by Ruffryder.

Electrical Wiring schematic for new engine.... 19 Mar 2015 17:36 #25

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Yup! Thanks for that!
"To get your engine going temporarily....
BLACK to BLACK ( battery -)
RED/PUR to RED/PUR (battery +)
PUR to PUR (ignition +, this will turn on ignition/fuel pump relays)
YEL/RED to YEL/RED. (starter relay)"

Then from here I should be able to figure it out via trial and error right?

**EDIT** Wait a minute, you have "RED/PUR to RED/PURPLE" however the boat harness has not RED/PUR wire, so do you mean the PUR1 "and" RED wire from the boat spliced into the single RED/PUR of the harness?

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1979 SunRunner 245 Flybridge
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Last Edit: by mmetzger1028.
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