TEMP GAUGE ACTING STRANGE-gctid816232

[bucluv]

Okay so here's a new one I thought my starboard engine was overheating but turns out that when I start my port engine or just turn the key to on position the starboard engine temperature gauge goes up 20 degrees and starts sending the alarm off. As soon as I shut down the port engine or turn key off, the starboard engine runs at normal temperature. ????? I have changed everything and done everything as far as overheating goes to my starboard engine and now I just found this out I am so confused

[carguy]

That is a bit weird. Let's break it down a bit. When you run the starboard engine alone, does it reach normal operating temp (about 180f)? What happens when you run on just the port engine? Same thing? When you have both of them running, how quickly does it indicate over heating and set off the alarm? Is it instantly or does it take a few minutes?

[builderdude]

Sounds like elecrtical issue. I'd start by checking and cleaning all electrical connections at the gauges and the negatives connections for them as well.

[bucluv]

As soon as I turn the key without even turning the other engine on the temperature gauge goes up anywhere from 10 to 15 20 degrees. I even disconnected the other gauge but when I turn the key the other temperature gauge still goes up I cleaned all connections and still tracing wires and cleaning them I'm pretty sure it is a bad ground somewhere. But like I said previously I changed everything manifolds Rises three different brand new thermostats and one of my Rises are still getting warm I have that spring loaded ball valve thing on top of the thermostat housing I even changed that and one of my Rises is still getting warm I even switched thermostat housing from one engine to the other engine and now the other engine is overheating a little bit the Riser is getting warm so I know it has to do something with that thermostat housing. I checked for blockage I cleaned everything out I put two new tee ball valve assembly on top of the thermostat housing but that one Riser is still getting warm no matter which engine I put that whole apparatus on meaning the thermostat housing and the T ball valve assembly

[Download_Complete]

Please don't cross-post. Focus your conversation on the topic open in Tech.