instrument lighting fuse(1969)

[hulter]

I am having the same problem on 68 charger with the gauges going to the right when the dimmer switch is pushed up to give more volts to the cluster lamps.  There are 2 power pins to the clluster and 3 sender pins from OP, temp and fuel senders.  The main supply power pin is 12v always and the other power pin is just for the lamps and gets its voltage off of the dimmer output which runs thru its own fuse in fuse panel as noted above.  If you get voltage bleeding (short) from lamp traces in cluster to gauges (they normally run on 5 volts due to resistor/limiter function), then in theory the gauges can get more voltage than normal and go to right.  When I turn up the dimmer, my 3 gauges go to right.

Does anyone know somebody who is set up to do bench testing of cluster with voltage to both power pins as well as having closed cicuits with resistance in place for each gauge to ck for stability of gauge when poweer is varied at lamp pin?

[smokinrt]

roger01,

long time since I've talked w/you.  my 69 charger headlamp switch has a pink wire running back to the fuse.  Hope that helps.  I can sympathize with your situation, I'm reinstalling my rebuilt guages, but first need to trace some previous shorts that caused my problems.

Good luck!!
smokinrt
Bryan Simpson
email gets to me sooner
bryanjs@sbcglobal.net

[roger01]

ok heres another attempt to get to the bottom of this .....when the doors are open and the courtesy lights are on ...and i click the dimmer up the dash lights come on and the fuel guage pegs out 
                                                                                 when the door is closed and the coutesy lights are off ....when i click the dimmer up the dash lights come on,and both signal lamps come on ....but the fuel guage doesnt peg out  it just goes to propper level
           can anyone tell me with this extra information what the problem could be .........

[roger01]

i forgot to mention that this is when the dash is out of its position  unscrewed and on the steering wheel