Electrical Help Needed-gctid819956

[Airxn]

Good morning,

All of my DC has stopped working, from bilge pumps to blower to accessories. The batteries are fine as both engines start up immediately. The charger seems to be doing its job when plugged into shore as it is showing 10A. 120V is fine but nothing to any DC system.

I'm not happy with how the previous owner had things wired and will be spending time changing things, but this sudden failure of ALL DC is baffling. The only thing that appears to be getting power is a Propane Sensor, which started to let off a high-pitched noise. This goes off the second any DC device (radio for example) is turned on.

The Bayliner manual says there is supposed to be a master circuit breaker "on the engine" (I have two, have looked and see nothing obvious).

Currently have 2x12V in parallel plus 4 6V is Series/Parallel as the house bank.

If anyone has any advice on where to look for the master circuit breaker as this makes the most sense to me given that everything DC is out, it is probably on the Negative line to ground close to the motor (or wherever final ground would be). Beyond that, when the time comes I will probably be seeking advice on wiring with switches as everything seems to be connected in parallel (no ACRs or Isolators either)

Have asked others at the Marina and all are equally perplexed about the placement of the circuit breaker.

Thanks in advance.

[Airxn]

"Airxn" post=819956 wrote:
Good morning,

All of my DC has stopped working, from bilge pumps to blower to accessories. The batteries are fine as both engines start up immediately. The charger seems to be doing its job when plugged into shore as it is showing 10A. 120V is fine but nothing to any DC system.

I'm not happy with how the previous owner had things wired and will be spending time changing things, but this sudden failure of ALL DC is baffling. The only thing that appears to be getting power is a Propane Sensor, which started to let off a high-pitched noise. This goes off the second any DC device (radio for example) is turned on.

The Bayliner manual says there is supposed to be a master circuit breaker "on the engine" (I have two, have looked and see nothing obvious).

Currently have 2x12V in parallel plus 4 6V is Series/Parallel as the house bank.

If anyone has any advice on where to look for the master circuit breaker as this makes the most sense to me given that everything DC is out, it is probably on the Negative line to ground close to the motor (or wherever final ground would be). Beyond that, when the time comes I will probably be seeking advice on wiring with switches as everything seems to be connected in parallel (no ACRs or Isolators either)

Have asked others at the Marina and all are equally perplexed about the placement of the circuit breaker.

Thanks in advance.

Couple of things to add:

There is no propane on the boat so the sensor is responding to current rather than propane, which is surmise is why it goes of when another device is switched to on.

The outdrives have power even when the engine is off, so both engines will start, the outdrives have power, but no DC instruments or accessories work.

[builderdude]

Don't know what boat you have details may be helpful. Your 12volt electrical issue is likely a bad negative connection, possibly under the helm area. Trim/tilt pumps are usually directly connected to the batteries, probably why they work.

[Pcpete]

You really need to let us in on the big secret. What year, length and model boat do you have? I'm going to assume the Bayliner part unless you tell it's something else. That, and, where are you?

[JimMc]

I too think the issue is the negative connection either at engine or helm.

The other possibility would be a fuse right at the house bank positive if so equipped.

[Airxn]

Sorry everyone. I have the boat details in my profile so thought they would show under my username.

1989 Avanti 2950 Sunbridge with dual 302 OMC Cobra engines

[Chief_Alen]

There are 2 fuse holders that pass thru a metal holder, they should have spring clips on them.

Disconnect the battery before messing with them.

Could be a blown fuse, or the contacts in the holder are dirty or bad.

[Airxn]

Any idea roughly where I'd find this/these?

[Chief_Alen]

Radio shack ...

http://www.marineengine.com/newparts/part_details.php?pnum=OMC0982019

[Norton_Rider]

The fuses are located on top of the engine and integrated somewhat into the wiring harness. Here is a photo of a 4.3 L Cobra. I circled the fuse holders. One fuse is for the outdrive tilt/trim and the other one is for the rest of the engine electrical.

The fuse holders and wires get corroded with age. On my previous boat I replaced the main fuse with a circuit breaker, like the ones Volvo and Mercruiser use: https://images-na.ssl-images-amazon....SR294,320_.jpg


Attached files

[Airxn]

Just curious, did you mount the Circuit Breaker away from the engine or affix it somewhere near the original Fuse location? If it turns out to be a fuse rather than circuit breaker (the manual and an OMC repair manual I have for my year both state Circuit Breaker) I think I would replace original fuse with a CB.

Thanks again

[Norton_Rider]

"Airxn" post=820091 wrote:
Just curious, did you mount the Circuit Breaker away from the engine or affix it somewhere near the original Fuse location? If it turns out to be a fuse rather than circuit breaker (the manual and an OMC repair manual I have for my year both state Circuit Breaker) I think I would replace original fuse with a CB.

Thanks again

I made a bracket and attached it to the engine close to where the fuse holder was originally.

[Airxn]

Awesome. Thanks for your help.

[bobmorgan]

"Airxn" post=819989 wrote:
Sorry everyone. I have the boat details in my profile so thought they would show under my username.

1989 Avanti 2950 Sunbridge with dual 302 OMC Cobra engines

You have to put them in you signature in your profile for them to show

[Airxn]

What can I say...i'm new.

Thanks