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Does anyone know how much if any a difference there is in the wiring between model year 11/1985 spider quad and and 1986 ? I have been looking at the dimmer switch and all the schematics (car disc, papajam ) show three wires out to 4 wires out on the 85 it is 6 wires 2 black 2 white/black and two whites .
Theory’s?
 

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But Mad North-Northwest
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I don't know for sure, but '85 to '86 was when they went from the dual pod to monopod, so my guess would be it's related to the lighting differences there.

Pro tip: if you just want the lights full bright, bypass the dimmer by jumpering white/black to white at the connector. This gets you a little extra voltage by bypassing the resistance of the switch. I generally do this on all the Alfas as they aren't really known for bright instrument lighting.
 
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