gauge cluster

[hardwarp]

Hello all...I just got my 71 going and when the headlights are the fuel guage high beem and blinkers all flash when the turn signals are on. If thelights are off everything works fine.

I have replaced the light switch and it didn't help. I'm thinking maybe ground but everything looks good and the wiring hasn't been hacked up. Any help would be greatly appreciated.

I will add all of the lights work it seems to be tied to the guage cluster.

[Jcfcamaro]

I'd check the ground and or add a ground.

[hardwarp]

Thats what I was thinking which ground? Where should I add a ground? Could it be on the

[VetteVet]

When you turn on the headlights you are getting a voltage drop to the rest of the lighting circuit. If you have poor grounds then the turn signals will ground through the path of least resistance, usually the dash cluster. I would ground the cluster with a separate ground from the tin to the cab chassis. Also the headlight grounds on the core support need to have good clean connections.
One or more of the turn signal housings could have a poor ground. I would suspect the front turn or marker lights since they power the turn indicators in the cluster.

[hardwarp]

Big shout out to VetteVet I ran a ground wire off the back of the cluster and the problem is solved. I can't thank you enough!