Wiring Issue

[benjie.kennedy@]

Putting interior back together on my 72 challenger rallye . Dash installed and power everywhere but nothing works ? Any help with ground issues or any other thoughts ? Only thing I do have are headlights ! Have checked dash light bulbs, fuses etc. all are good ! Help !

 

[moparleo]

Power every where ? Power to cluster? Cleaned/replaced all fuses ?New or old harness ? Need more detailed info. Pictures help a lot.

 

[benjie.kennedy@]

Yesir , power to cluster and everywhere under dash ! Everyone says it has to be a ground problem but were not sure where the ground comes from for the inside and rear? we don.t have anything on the rear either ? no taillights ect. ? I don.t have any grounds under hood other than neg. battery to engine and small lead from neg. cable to body ???

 

[70chall440]

The ground for the dash cluster comes from the dash frame which comes by contact with the body (bolts/screws across the top and the 2 side 1/4-20 bolts). Run a 10g wire from some place on the dash frame to the fire wall ensuring that you have no paint on either end.

 

[Challenger RTA]

Headlight power comes from splice one,behind cluster.and it should complete the curicit througth ground wire in front of battery. With headlights on remove ground. That would be the 2 smaller wires. light should go off.if not you have other problems. bottom of fuse box connection 1 reads ACC other reads BATT,see if there hot. Power everywhere a little vauge. connect a wire (jumper cables negitive only) to battery ground and use it to probe for power.

 

[benjie.kennedy@]

Mike who is doing the interior has checked all dash lights etc with test light. We have power to them but nothing works?

 

[benjie.kennedy@]

Also have neg battery ground to body( small wire) pretty sure that’s why we have headlights?

 

[themechanic]

Battery ground to radiator support and engine, engine ground to firewall, dash ground to A-pillars and each separate screw clip needs bare metal under them as it was from the factory.

 

[benjie.kennedy@]

Thank You !!

 

[EV2RTSE]

This screw is a critical ground, especially for the wipers.

 

[themechanic]

Battery ground to radiator support and engine, engine ground to firewall, dash ground to A-pillars and each separate screw clip needs bare metal under them as it was from the factory.

Here's a much better explanation of dash frame grounding.

Instrument Panel Grounding Tips Mopar Plymouth Dodge

www.performancecargraphics.com

 

[benjie.kennedy@]

Anyone know where I can get actual Photos of under dash wiring? We have power and ground everywhere in dash but nothing works exept headlights ? Have ground from batt to engine and body,engine to firewall dash to body? headlight indicator on dash works but lights stay on dim? Anyone know what this connecter is ? Two red going into this plug that appears to be all ground ?

 

[Challenger RTA]

 

[benjie.kennedy@]

Thanx !

 

[Challenger RTA]

 

[benjie.kennedy@]

View attachment 88686

Thank You ! Thats what I,m talking about !!!