I'm pretty sure "our trucks" never had relays for the headlights (which is why the switch is such a big mofo). It sucks but can be easily corrected with 2 Bosch-type closing relays (My truck had the relay conversion done but i redid it with 2 dual relays).
Connect pin 30 to constant positive from the battery, 87 to the headlights' positive side from the relay, 85 to ground and 86 to the old headlight wire coming from the headlight switch (dimmer switch). Do this with both the high and low beam wires and you'll be really impressed. I removed all of the stock wiring(except park lights) from the headlights to the firewall but left enough to wire the 86 terminals in place, took about 6 hours total (would've taken less but i wanted it perfect)
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1979 C-10 shortfleet: Olds 350, Th400, 12 bolt
Current project: 1969 Olds 455 W-30, needing a rebuild
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