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iliketoski

Name these sensors (please)

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MLA

#3 with its 2 wire weatherpac connector is the the ECM temp sensor for sure. One of those could be the gauge sender and one could be a hot light switch.

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RTS

The one with the single brown wire (#2 on your picture) feeds the dash temp gauge...I'm pretty sure.

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Lance B. Johnson

1 Coolant temp sending unit gauge

2 Coolant Warning

3 CTS = Coolant temperature Sensor ECU

But.....you can figure out 1 and 2.

Ignition on, disconnect the sensor 1 and ground the connector to the engine block via jumper wire. The gauge should go to full hot (if this is the gauge wire)

Do exactly the same for 2 and see what happens. This will help you isolate which wire goes to what.

3 is absolutly for ECU so no worries there.

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MadMan

Talk about sensor overload, THREE coolant temperature sensors!!! I thought mine was bad with 2.

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Engine Nut

#3 coolant temp sensor for the ECM. #2 Temp sender for the dashboard gauge. #1 Temperature switch for buzzer or light (closes when it gets hot).

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iliketoski

thanks for all the answers. This place is such a resource!

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formulaben

1 Coolant temp sending unit gauge

2 Coolant Warning

3 CTS = Coolant temperature Sensor ECU

#3 coolant temp sensor for the ECM. #2 Temp sender for the dashboard gauge. #1 Temperature switch for buzzer or light (closes when it gets hot).

Well, which is it? :dontknow:

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iliketoski

#3 coolant temp sensor for the ECM. #2 Temp sender for the dashboard gauge. #1 Temperature switch for buzzer or light (closes when it gets hot).

This is what I'm thinking, but was going to try the test.

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RTS

I'd go with what EngineNut said....seeing as how he has Indmar Marine Engines in his signature

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John I.

Larry (Engine Nut) responded to an email I sent to Indmar years ago. I would say he knows his stuff.

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formulaben

Larry (Engine Nut) responded to an email I sent to Indmar years ago. I would say he knows his stuff.

Guess I need to read sigs more often! Yeah, Larry was VERY helpful to me when I bought my boat and had an inquiry about a transmission service advisory. Thanks Larry!!

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