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Author Topic:   Temperature Sending Unit?
JohnT posted 06-26-2001 10:52 PM ET (US)   Profile for JohnT   Send Email to JohnT  
The motor: 1990 Johnson 88SPL (on 1977 Montauk).
Returning to dock on Sunday, I noticed that the temperature gauge was pegged. Motor was running smooth as silk - NO indication of overheating other than the gauge ([confidence stream] running strong as ever). I shut her down.

Today after work, I went out to investigate the problem. Put the key in the switch - immediately (before even cranking) the temp gauge jumps into the red. Motor cranked up fine, sounded fine, [confidence stream] running strong. Temp gauge is pegged. I shut her down.
My guess is that it's either a bad temp sending unit or a short in the wiring somewhere. What's the consensus around here as to what I should do now? Anything else I should check?

Thanks in advance for your responses.

Tom W Clark posted 06-27-2001 12:57 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
John,

It's most likely the wiring to the gauge, not the gauge or the sending unit. Make sure there is + and - power to the gauge and the sender wire (tan) does not have power running through it.

Whaletosh posted 06-27-2001 09:44 AM ET (US)     Profile for Whaletosh    
Try this as well. Find the temperture sender on the engine and disconnect it. It should have tan wire. The meter should read nothing or very little. If it doesn't you have a defective meter or a short to ground on the sender wire somewhere, possibly right at the meter itself or anywhere along the line.

If the meter reads nothing or very little gound the sender wire to the engine block. Use the head of a bolt or something that isn't painted, the case of the starter should work well. The meter should get pegged. If this happens then you have shorted sender. Replace the sender.

You can do this without the engine running, but with the ignition on. Just make sure you don't start the motor unless you have a flusher hooked up and providing water.

Sean

JohnT posted 06-27-2001 10:25 AM ET (US)     Profile for JohnT  Send Email to JohnT     
Thanks, Tom and Sean, for your suggestions - I'll follow both and report back.

Thanks JimH for modifying my original post using the correct term - "confidence stream" - instead of what I was calling it.

lhg posted 06-27-2001 03:34 PM ET (US)     Profile for lhg    
We know all the nicknames for this, but the engineering term is "telltale".
Bigshot posted 06-27-2001 04:41 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I am biting my tongue on that one!
Tom W Clark posted 06-27-2001 06:34 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
jimh,

"confidence stream"?! Did you make that up? Boy, if you've decided to start editing our posts for proper English and spelling you're going to be very busy.

Myself, I prefer the French: pissoir

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