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Wiring Issue

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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 !
 
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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

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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

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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.

20211213_150353.jpg
 
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themechanic

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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.
 

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EV2RTSE

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

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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 ?
 

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