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2 temp sensors?

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2 temp sensors?

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Old 03-16-2019, 07:40 PM
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Default 2 temp sensors?

Changing thermostats and broke a sensor on the port side of the thermostat housing. There's another sensor on the starboard side of the thermostat housing. I'm sure 1 is for the temp gauge but what's the other one for?
I tried looking on this site but no luck: https://www.mercruiserparts.com
They are 1990 454 mag engs with "new style" thermostat housings.

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Old 03-16-2019, 08:37 PM
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Found this page: http://media.channelblade.com/EProWe...ng%20horns.pdf
Maybe the "other sensor" is a over-temp warn switch for the warning horn?
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Old 03-16-2019, 08:53 PM
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one is for the alarm system.
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Old 03-16-2019, 09:12 PM
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Thx for confirming. Any idea where I can order 1 online? I've been searching the net for a while and came up with nothing.
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Old 03-17-2019, 01:18 AM
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Its in the Audio Warning System section for your engine. Its #1 in the parts list
https://www.mercruiserparts.com/bam/.../31808/961/320
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Old 03-17-2019, 12:54 PM
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Thx Griff.
Don't know how I missed that.
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Old 03-17-2019, 09:24 PM
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I went thru the wiring for all 3 sensors that can turn on the warning horn on both engs and all looks good. I would like to verify the coolant temp switch works properly (on the eng I didn't break the sensor). Anyone know what temp the coolant temp switch is supposed to close?
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Old 03-18-2019, 12:26 AM
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The alarm will sound right around 195-200* from what I remember
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Old 03-18-2019, 01:05 AM
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Thanks again Griff.
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