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Wiring size is somewhat subjective, but the general rule is bigger is better. Late model cars use wire as small as 18 gauge for taillights and such, however, I suspect the reason for that is solely to save a few bucks in the manufacturing process. The only drawback to using larger wire is that it may not be as easily routed and take up more room. In my projects I never use wire smaller than 14 gauge for anything. I suggest that's what you use for lights and most other accessories. Other systems require heavier gauge. Use 12 gauge for heater/AC, electric wiper, horn, cigarette lighter, and alternator if under 65 Amps. If over 65 Amps use 10 gauge and for a 100 Amp one-wire use 8 gauge. If you run an ammeter, match the wire gauge with the same you are using for the alternator (use a voltmeter instead if you can and you only need 14 gauge). I have rewired several rods from scratch using these guidelines and have never had a problem. Hope this helps.
Thanks, John. I decided I needed a couple of hours to work on Earl and to heck with the jobs. Unfortunately, I'll be back to the salt mines tomorrow. I'm still hoping I'll be down to one job by the end of the summer. I can't wait to get back here more than once every two months to see how everybody's doing.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.