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Old 07-09-2024, 05:55 PM   #1
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Default temp sender(s) bad?

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?!?
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Old 07-09-2024, 06:33 PM   #2
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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.
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Old 07-09-2024, 06:37 PM   #3
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Default Yes I did, but

I used my merc thermostat housing and heat exchanger. Temps were reading fine until about two weeks ago?
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Old 07-09-2024, 06:37 PM   #4
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Other engine reads perfectly
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Old 07-09-2024, 07:15 PM   #5
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I would check the positive and negative voltage at the gauge to verify it matches the other side.
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Old 07-09-2024, 07:42 PM   #6
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Default will do

thank you agian.
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