Re: Mike's 55 Pat
Posted by HH56 On 2015/4/4 23:01:45
The instrument voltage regulator supplies 5v to the temp, gas and oil gauges. If all gauges are inop then most likely the regulator has failed or not getting power. Check for 12v on the center terminal and a voltage out on the end terminal. If no solid 12v in, it is powered from the instrument fuse and sometimes those contacts in the fuseholder can oxidize and not make contact. If the 12v is present then regulator should have a voltage out but may be hard to measure accurately. When operating properly regulator pulses 12v off and on at a frequency to produce an average 5v to feed the gauges. Some meters are too slow to measure pulses and will not average well to give a good reading.
On the windows, you should have 12v on the red wire at end of round circuit breaker and then out of breaker into the terminal on relay end. When you turn the key on you should have 12v at the small (red??) wire on the far side terminal and the relay should close. The 12v should then be on the middle terminal which holds the large red wire going into the rubber grommet to feed the window switches and motors.
EDIT: Forgot to mention the regulator also needs a good ground to operate so make sure it is tightly screwed to the cluster.
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On the windows, you should have 12v on the red wire at end of round circuit breaker and then out of breaker into the terminal on relay end. When you turn the key on you should have 12v at the small (red??) wire on the far side terminal and the relay should close. The 12v should then be on the middle terminal which holds the large red wire going into the rubber grommet to feed the window switches and motors.
EDIT: Forgot to mention the regulator also needs a good ground to operate so make sure it is tightly screwed to the cluster.
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