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Electrical Question: Hooking up an aftermarket ECT gauge

 
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Old 11-18-2010, 12:30 AM
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Electrical Question: Hooking up an aftermarket ECT gauge

I've literally done everything and replaced everything trying to pin down my overheating issue. I'll recap just for reference;

-Coolant flush x2
-40/60 coolant to water ratio
-Thermostat to 180 degree
-ECT sensor
-ECT sending unit
-Different ECU
-Different stock gas/temp gauge cluster
-Bled of air each time I changed something
-New radiator cap
-System pressure test (Held PSI steadily)
-Probably a few other things

-Problem is: Heat goes up randomly and will remain 'hot' as I drive, but turning the car off and right back on resets the temp gauge to only 2 blocks, and it remains normal from there.

So I bought an aftermarket gauge I'm running straight from the sending unit, bypassing the ECU, and I'm not even mounting the thing inside, just gonna tape it to the cowl or something.

My ultimate goal is to have this new thing connected WITH the stock gauge so I can monitor both simultaneously, but I'm running into problems with that. In my trial connections, when I turn the car off, the aftermarket gauge reads 270 degrees-it basically maxes itself out rather than going to 0. When I turn the car on, it goes to 230 degrees. During this time, the stock gauge rises according to how long I leave the car on, so it seems to be functioning properly. I'm wondering if the sensor wire hasn't enough voltage traveling through it to be able to handle these two sources. Could that be a valid issue? Because both gauges draw their own power separately from the sensor wire, but not having a reference for this problem has left me to pioneer it on my own.

If anyone has other ideas on how to do this, lets try it.
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