95 Gt...couple electrical questions

View attachment 226811


it may go to secondary air injection tracing it by eye... your car have smog/egr?

Did Pin 17 achieve ground when the AC is turned on (or the car reached 230*F [if you felt like running it that hot])?

You idea to test continuity is fine.

There are other work-arounds if you wanna fix it on the cheap (if low speed functions properly). You might find the driver is not functioning properly for high speed. Such solutions include switching the low speed output over to the high speed fan terminal, and then using a relay to energize the fan when the AC is turned on. You could also go to an aftermarket fan controller or fan switch.

Good luck.

It's late and I'm wiped so apologies if I missed something.

I never ran 12V to Pin 17 so I'm not sure what to make of that.

When you ground Pin 17, you obviously get 12V on pins six and seven, right? Otherwise, without 17 being grounded, six and seven will be cold.

The 10-amp-EDF-monitor fuse doesn't show voltage normally that I recall. It never did when I tested it anyhow. I never found much for info anywhere (including the shop manual) on the EDF monitor. Because it's solid state, it was just a variable to me. If anyone finds something, please let me know so I can ammend the Wiki tech note.

When you unplug the ECT and it runs (should be low speed), that suggests the EDF monitor functions and the illuminated CEL is normal.

I understand you wanting to get the OEM set-up to function. I think some of the issues people have are with the driver(s) for the fan. Yours sounds like more than that since your issue is not just temperature-switching related (normally it's one speed or another not engaging at the proper temp threshold).
For jollies, you might wanna check the ECT calibration. You'd need an aftermarket temp gauge or the ability to view PIDs to really nail it (or some means of accurately determining coolant temps in the intake).

If you do get fed up, a 25 dollar temp switch (better than an adjustable controller IMHO) should get you a fairly reliable set-up if the CCRM relays are in decent shape. Other options are more expensive.

two of the connectors in that harness go to the fan some how... i touched them together and blew the fuse for that today. Also the red wire goes in on a side with 4 pins if we are indeed talking about the same connector. only 3 pins come out the other side on my car that red is hooked in to nothing on the male side of the connector

Maybe useful info

Nicely done!