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Did a motor swap on my 99. Got everything hooked up and find out my ECU is bad. They don't go to 0 anymore... Mechanic checked all the wires. He said the ground wire was never correctly hooked up to ECU, but he fixed it and it still doesn't work.
Any explainations?! Or do I have to get new guages? :-/
 

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trouble shooting cluster

Did you swap any componets? Remember for the 99-04 MY, the cluster and PCM are programmed for EACH OTHER. Changing either one requires re-programming.

Have you checked all of the fuses? Especially F2.21, F2.5, F2.34, and F2.37.

Note, the cluster is grounded at G204 which is behind the center console. This is a ground shared with multiple devices including the radio. It's frequently messed up during a radio install.

Can you access the cluster diagnostic mode? If so, post any codes.
http://www.allfordmustangs.com/forums/v6-tech/49159-diagnostic-mode.html

If still no problem found, disconnect the cluster electrical connection (C220b). Measure the resistance with the key off of Pin #1(BK) and Pin#20 (BK/WH) back to battery negative. Should be low. If not, the cluster ground is bad. Will have to find out why.

Confirm +12 volts at pin#10 (RD/WH).

With the key on, confirm +12 volts at Pin#11 (PK/BK) and pin#12 (WH/LB).
 

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