temp sender(s) bad?

[geoffm70]

so one of my temp gauges wont go over 125/130, heat gunned the thermostat housing and its 142.

ground out the wire and the gauge goes to max.

got a new gauge, again, max 130?

got a new sender, same, got another new sender, same?!?

[mmwjr]

You switched to Volvo engines if I recall; correct? I know on Mercruiser the sensor is on the thermostat housing and the gasket has brass eyelets to ensure a good ground however I have seen these go bad adding resistance throwing off the reading.

[geoffm70]

I used my merc thermostat housing and heat exchanger. Temps were reading fine until about two weeks ago?

[geoffm70]

Other engine reads perfectly

[mmwjr]

I would check the positive and negative voltage at the gauge to verify it matches the other side.

[geoffm70]

thank you agian.

[geoffm70]

the thermostat housing was full of salt build up?

[mmwjr]

Originally Posted by geoffm70

the thermostat housing was full of salt build up?

Interesting. Thanks for the update.