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Shakercars's 1972 Trans Am

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Bud Sisto

secondary power to the light switch 66 pontiac bonne


Can't seem to decipher the wiring schematic for my 66 Pontiac Bonneville. Specifically the headlight wiring. There is supposed to be 2 sources for power, one for the front park lights and head lights via the big red wire going to it. It energizes first the purple wire to the front park lights on the first click out and then the blue wire to the dimmer switch on the second click out.  That part is fine but, the other half of the switch is supposed to energize the instrument panel on both 1st and 2nd clicks, which basically connects the brown and white wire to the double green on the headlight switch. The brwn and wht wire goes to the center part of the fuse block and the brwn wire to the front park lights is fused off of it and also fused off of it is the drk green wire which goes to the rheostat connection #3 and jumped off of that is a green wire to the ignition lamp. There is no supply of power in the fuse box to the headlight switch with these wires and as I mentioned before, the headlight swich merely connects the brn/wht wire to the drk grn. All that being taken in, WHERE does the power come from? ANYBODY?( for the inst. panel lights). Hopefully the schematic I upload will provide the information for someone else to figure out my dilema.  Thanks, Bud. P/S. 65 is the same as 66

65 wiring scm..jpg

pont wire 65 pt 1.jpg


head light switch.jpg

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In case no one wants to tackle my previous post. I'm providing the schematic with the wires colored so they can be traced easily. Thanks again for any input. I'd like to wire it properly but, I fear I'll have to jury rig it somewhere unless Someone finds the answer. Bud



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This is the actual GM pontiac manual from 1965..I know you said yours is a 66 and said 65 Was the same..Took photos with phone hope you can see them OK..Thought might help you in your quest for secondary power source...






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