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Old 04-22-2012, 06:03 PM
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wiring up a 48 gmc

new guy here...2 questions...which is better a built in regulator on a alternator or have it seperate and how to wire the ignition, alternator and battery...first time wiring a whole vehicle...

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Old 04-22-2012, 06:38 PM
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Go with an internal regulator. 1 wire or 3 wire GM alternator, both work fine.
Look into Painless or Ron Francis or several other wiring systems.
Wiring harness systems are on of the most frequently discussed subjects in the forum. Take some time and review the comments from other posts.

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Old 04-22-2012, 07:08 PM
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I'd go with a 3 wire over a 1 wire........ as suggested I'd go with a painless....... I put one in my vehicle and have no complaints
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Old 04-23-2012, 01:41 PM
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alternator

thanks guys...will go with the painless, soon as i get some extra money
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Old 04-23-2012, 08:04 PM
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If your old wires are decent, it's not hard to convert the old external reg to the newer style, basicly two short jumper wires and a new heavier gauge wire from the battery or junction block to the old horn relay buss bar.

attached is Doc's conversion dia
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Old 04-24-2012, 02:19 PM
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wiring my 48

i am rewiring the whole truck...bought a wiring kit to do the whole truck...
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Old 04-24-2012, 06:56 PM
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I'd suggest go to lowes and get a set of thier heavy crimpers, I think they were Klines, they had a green stripe at the cutting end of the handle, they work very well for crimping the terminals on. Takes a bit of practice but once you get the hang of it they made OEM looking/quality crimps. Napa sells the type 56 terminals that are used in the fuse box, there should be some un-used holes in the fire wall connector and the fusebox....... very handy for adding some additional wires into the cab without drilling holes etc....... I passed thru my, temp, oil, wiper relays, headlight relays, and my speedo electric sending unit wires etc....... very neat install and one connector takes care of everything, sealed all the unused holes as well as the wires with some black RTV.
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Old 04-25-2012, 01:54 PM
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48 wiring

i ran my main wires like lights, turn signals, etc...through the big hole top corner....i seen the other holes you are talking about...i have 3/4 of it wired up...running out of funds to buy gauges, alternator, regulator, horn...next year hope for gas tank...
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Old 04-25-2012, 06:40 PM
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I ran mine individualy using terminals, so if I ever have to work on it later...... just unplug the main connector and poof ..... easy days
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Old 04-27-2012, 12:33 PM
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48 wiring

that is a good idea....
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