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#1
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1966 Pontiac GTO under dash wiring
Trying to decipher what I have. Working on 66 GTO 4 speed console car none A/C rally gauges. The under dash wiring is M&H.. Looking at there website it seems they do not offer a harness for a 4 speed car with gauge package. Closest is automatic w/gauges. Is there one offered for 4 speed console GTO's with gauges? On the left side of the harness there are 3 pairs of wires with 2 wire each and a plug at the end. 2 purple 2 green and 2 orange. I figured the purple are neutral start. Although I don't 66 manual 4 speed had a neutral start. Anyone know what the other 2 pairs are for? Also the diagram refers to a master switch and a master relay.. Where are they located and what do they do? Is that for A/C cars only? I appreciate any input.
Last edited by 1950Mercury; 01-29-2024 at 02:28 AM. |
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#2
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The green pair would go to reverse switch . The orange pair would go to the downshift switch if it is an A/T. I belive this is correct and I think you are correct on the master switch and relay.
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#3
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The purple pair would be the start circuit. On your car there might be a switch on the clutch pedal .
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#4
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As stated, the purple ones should be the starting circuit. No clutch switch until 69; the factory put a jumper on that plug for manual transmission cars.
Importsmasher
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Scott Baggiore 66 GTO convertible 389/4 speed (parents bought new) 73 Firebird Formula 400/4 speed 74 GTO 455/4 speed 74 Grand Am |
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#5
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while you've got the car apart it might be a great time to hook-up an underdash kill switch using those purple leads
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#6
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As mentioned the NS wires would have a jumper installed on MT cars.
Nothing more than a small C-type connector with rubberized insulation on the outward portion. This would be plugged into the plastic connector to complete the circuit. Factory Jumper Shown;
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When I die, I want to go peacefully like my grandfather did, in his sleep. Not screaming like the passengers in his car. |
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