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Discussion Starter · #1 ·
I got problem with my temp gauge, it always stay low never go high when the car got hot. It is a one wire with a sending unit in my intake manifold. When i remove the sending wire on the sending unit , the gage still read low but i head it is supposed to read full ?? I try to ground my sending unit directly on the block and the neddle goes more lower ? Should i try to ground the base of the sending unit with alligator clip and try to give some heat to see if it work ? Or the gauge is no good ? Thank you
 

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I got problem with my temp gauge, it always stay low never go high when the car got hot. It is a one wire with a sending unit in my intake manifold. When i remove the sending wire on the sending unit , the gage still read low but i head it is supposed to read full ?? I try to ground my sending unit directly on the block and the neddle goes more lower ? Should i try to ground the base of the sending unit with alligator clip and try to give some heat to see if it work ? Or the gauge is no good ? Thank you
With key on put a test light to ground on battery and dis connect and probe the terminal on the wire for the sender. Gauge should slowly rise to hot. If it does the sender is bad or it has no thermostat or it's stuck open. If gauge doesn't rise it's a gauge or printed circuit problem. Ernie.
 

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Go inside and boil a pan of water, bring it out and stick the probe in it... That will at the very least confirm whether it's reading engine coolant temp or something else is wrong. Is this ATM 3337 a capillary temp gauge or is it electronic? Looked it up and no pics of how to install or what the sending unit looks like.. :p I looked everywhere.
 

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Discussion Starter · #7 ·
Thats the model :


With key on put a test light to ground on battery and dis connect and probe the terminal on the wire for the sender. Gauge should slowly rise to hot. If it does the sender is bad or it has no thermostat or it's stuck open. If gauge doesn't rise it's a gauge or printed circuit problem. Ernie.
is there another way to be sure the gauge itself is bad because everything is new? By bench test all this together?
 

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Thats the model :




is there another way to be sure the gauge itself is bad because everything is new? By bench test all this together?
You could totally bench test it, just need a 12VDC power source and hot water with a thermometer... Should be pretty simple.
Take the gauge out (or leave it in) and just use a remote 12VDC power source and a pan of hot water... Bypassing the vehicle's wiring
 
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