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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Wiring help needed: rear defogger and switch

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G3GM :: G3 Tech :: Electrical

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Wiring help needed: rear defogger and switch Empty Wiring help needed: rear defogger and switch

Post by gpoetx Wed Jan 11, 2012 3:09 pm

So I want to add the defogger and switch to my sons 1974 Laguna. I have the unit and switch, what I can't find is a diagram. Does anyone have a diagram or at least point me the way to wire this up. Not sure if there is a relay or where the 3 wiring ends from the switch go. Thanks for any help.
Gary
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Post by 1973 454 MONTE Wed Jan 11, 2012 6:31 pm

i have a harness. will try and get pics.
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Post by thatfnthing Fri Jan 20, 2012 2:51 pm

FWIW, from the Monte Carlo:

- Pink 16ga wire from fuse box ACC tap to center terminal of the defog switch, but with a 4A inline fuse along the way
- Purple wire from switch runs directly all the way back to the fan. This feeds full 12V to fan for high speed.
- Yellow wire leads to white resistance wire, which then splices into purple wire. This reduces voltage to provide low speed. If you don't have the resistance wire, you can probably splice in an actual resistor, but I don't know what the value should be.

Mark
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Post by gpoetx Fri Jan 20, 2012 4:10 pm

Appreciate it, I think just to be simple I'm going to make it Hi/Hi and skip the low.
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