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Brown wire is the capacitor for the radio, black wire is the ground for the gauge cluster, the male grounding tab should be on one of the top screws holding the speedometer / tach assembly to the bezel near the headlight/ brake warning bulbs
I'm going by the fact he had the cluster out, and the brown was disconnected before he had it out. The brown is coming out of the cluster harness bundle, not the center console bundle.
I'm going by the fact he had the cluster out, and the brown was disconnected before he had it out. The brown is coming out of the cluster harness bundle, not the center console bundle.
Rich
A dangling brown wire, that length with a connector like that, should not connect to a condenser. That’s just my opinion, I hope we find out for sure. I’m wrong as much as I’m right, so it would not be a surprise.
Easy enough to find out. If everything works without it connected then it’s for the capacitor. If there’s already a brown wire on the fan switch then it’s not for the fan. I don’t like the capacitors in the circuit so I wouldn’t connect it if it was for the radio am noise suppression but that’s just me. I don’t have any cars judged and I don’t like 12 V connected when not necessary.
That appears to be correct, I don't have that diagram nor have I seen that wire, but now I have seen the light. Does anyone know, physically does one lead connect to the ignition switch and the other to the fuse box? I can't figure what it's filtering unless it's the power line on the fuse box to stop am noise when changing the ignition from off or acc to on.
That appears to be correct, I don't have that diagram nor have I seen that wire, but now I have seen the light. Does anyone know, physically does one lead connect to the ignition switch and the other to the fuse box? I can't figure what it's filtering unless it's the power line on the fuse box to stop am noise when changing the ignition from off or acc to on.
This wire is tied back in the cluster harness but is NOT shown in any GM wiring diagram, from 1963 to 1967. That's where the confusion begins. All subsequent vendor diagrams that I've seen do not show it either. and I'd guess because they just glorified and colorized the raw GM diagrams.
I have a '67 main harness in the shop and I'll get it out later to do a quick continuity test to see it's source. It may be the raw UNFUSED feed from the IGN switch, before the HEATER and RADIO fuse circuits. If it is, then it's also for the Wiper Motor and Washer Pump relay, which do not have a CAP directly mounted to them.
The U69 suppression designers added this Cap, in addition to all the other "anti-clicking" Caps for meters, switches, heater motor, ign coil, flashers, etc), and it appears they decided to add this Cap at the instrument cluster for the radio, etc, using a screw that was "existing", near to the oil gauge.
If it's feed comes from the fuse to the Radio, then it's just for the radio, but electrically tied(via the fuse) to all other Brown ACC items up/downstream too. It cant... Radio fuse output is Yellow wire.
I'll check in later with the harness test results to see it's source.
It's tied directly to the IGN Switch Brown feed. So it's likely for the Wiper Motor/Washer Pump relay, and touches the radio and all other ACC circuits.
Here's the fuse panel wiring. This is 67 only. 63-66 similar for this circuit, except the hazard flasher function.
Bottom brown is the Orange(always on feed) for the hazard flasher output feed to the directional switch integrated hazard switch(67 hazard lamps were standard equipment) The hazard switch was part of the directional switch.
Center brown is from the IGN feed, to inputs of fuses for Htr & Radio. This also is tied to that "brown" radio capacitor wire in question.
Top brown is the output clip for the Htr blower fuse.
Yellow is from Radio fuse to Radio, fed from IGN brown(center brown wire).
03-07-2024, 09:46 AM
67 cluster wiring issue
