Guest myfirstbuick Posted July 13, 2006 Share Posted July 13, 2006 Hi,I'll throw this out for all the electrical gurus - I have an understanding of home electrics so this puzzles me on my car... I am doing a re-wire starting with the headlights. According to my shop manual diagram, it shows 16 gauge wire coming from the headlight switch and going to the headlights. It has a branch off wire that goes to the dimmer switch using a 12 gauge wire. Why the different gauges? I don't understand and would like an explanation because it's my understanding that the 12 gauge wire is overkill branching off from a 16 gauge wire.Thanks! Link to comment Share on other sites More sharing options...
Guest imported_JPIndusi Posted July 13, 2006 Share Posted July 13, 2006 Good question and I will check some wiring diagrams I have for 48 Buck Special. A possible explanation is that each individual light might be fed by a 16 gauge line, but the single dimmer switch feeds both upper beams, essentially it carries current for two lights.Joe Link to comment Share on other sites More sharing options...
critterpainter Posted July 16, 2006 Share Posted July 16, 2006 39 Buick headlite switchs are WIERD!!! they have a city and a country mode. In the city mode both headlights drop to low beam, on the country mode only the left headlight dips to low beam. Perhaps this is the wireing you are seeing???Bill Link to comment Share on other sites More sharing options...
mlander Posted September 18, 2006 Share Posted September 18, 2006 1937 Buicks were unusual also! I wonder if there is a relay in there somewhere?M.L. Anderson Link to comment Share on other sites More sharing options...
Guest DaveCorbin Posted September 19, 2006 Share Posted September 19, 2006 All of you are on the right track sort of. The headlight switch on a 39 is complicated by the fact noted above of the city/country mode in relation to the Hi-Low beams. The dimmer switch has to carry the current for both lights, so it needs a 12 GA both ways. There are 2 wires to each headlight(4 total), one for HI and the other for Low. In city mode on the switch, the dimmer moves both lights to Hi or Low. In country mode, only the left headlight goes Hi-Low. Just to really set your head spinning, the same setup is used on a RHD car, except everything runs exactly the other way, which means that the bulbs also have the relationship of the internal elements reversed. Use both hands with your index finger pointed out to illustrate these combinations for yourself and you'll see what I mean. I rewired my 39 Roadmaster about 25 years ago and about went nuts tryingto figure this out!Regards, Dace Corbin Link to comment Share on other sites More sharing options...
jeff Posted September 19, 2006 Share Posted September 19, 2006 To clarify, if I may, the left headlight (driver's side) points toward the right side of the road, illuminating the shoulder. This is the one that stays in high beam mode on country setting. The right headlight (passenger side) is the one that would blind an on-coming driver. It's the one that switches from high to low with the foot switch. On the '38, the fender lights come on when the foot switch toggles to low beam, they go off when toggling to high beam. We may be saying the same thing.Jeff Link to comment Share on other sites More sharing options...
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