Weird dash issues - 66 Valiant

[nh_mopar_fan]

Guys,

I am at a loss. The car is a 66 Valiant ragtop. I continue to have electrical issues with the cluster. With the car started and the lights off, I get a very faint glow that pulses on the cluster lights. The gas gauge does nothing. The temp gauge has a mind of it's own, it seems to pulse higher and then lower and when I turn on the headlights, it sits there for a moment and then it pegs.

I've already run an extra ground from the cluster to the steering column.

I checked the grounding at the headlights and it appears to be fine.

This is a brand new dash harness that I installed yesterday. I had these issues with the old harness and since it had been hacked and I had other issues with that harness, I just replaced it.

I have one question, the ignition switch that was in the car had one extra pin on it that is unused. It's marked ground. The new switch that I bought is the same. There is nothing on the new or old wiring harness going to that connector.

Could this be part of the issue? I'm thinking not but am at a loss now.

Do I have the wrong ignition switch? Should I run a ground wire from that connector?

Any help would be appreciated!

[mikepmcs]

Does a first gen have a voltage limiter?  If so, a new one of those might be a start.  I won't pretend to be able to t/s this but have seen the words voltage limiter thrown around here quite a few times for similar issues.

v/r
Mike

[nh_mopar_fan]

It's on the back of the cluster. I had a spare (condition unknown) that I've swapped in with no luck.

[2Gunz]

I had the same sorta thing happen with my cluster.

Turned out to be the connectors on the back.

I cleaned them up and put on some electrical grease conductor

(I forget what the technical name for it is, basically an anti - corrosion
paste that also conducts electricity)

and the problem went away.

[nh_mopar_fan]

Thanks. It's been at the paint shop so I haven't had the chancxe to get back to it. I will be getting back into it this week.