ukdm gauge cluster (150mph)
three gauge pod in place of radio
new wire harness ( no problems there)
everything has been working for years, few days ago installed the ukdm cluster
all lights worked and so did the dimmer switch. I was able to drive around for one whole day before it started to have problems.
first the lighting ground wire to my 3 gauge pod started smoking, this was bolted to the cluster ground.
unplugged the power and ground from gauges and continued driving
then the cluster's temp gauge would rise under any electrical load once it hits operating temp
checked and re-pinned the cluster, every light works as it should.
checked, cleaned and re-tightened every ground on the car, extra grounds on headlights, starter, alternator.
wired together the dimmer switch (info is the uk and edm cars did not have the dimmer, only some germans ones.)
this made a small difference but the temp needle would still climb
pulled fuses one by one and nothing changed
replaced coolant temp sending unit, no change
plugged in original cluster and the problem was still there
battery is reading 13.9 - 15v...
since this happens under any electrical load and the battery voltage is a little high I am thinking the voltage regulator in the alternator is going but the connection to the temp gauge has me unsure...
edit: I jumped the brightness control wires at the knob, not at the control unit under the dash, I will try that in the coming days