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Old 02-11-2005, 12:17 AM
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4 wire alternator?!?!?

I have a 4500 watt, 12 speaker system in my nova, it runs off of a separate battery and alternator than the rest of the car (it draws 165 amps at peak output) i just recently finished the install and here is my question...Im using a 120 amp cadillac alternator that I pulled from the junk yard and rebuilt to run the engine, head lighst ect (just not the system) my problem is that it has 4 wires.....one main power wire going to the battery, one wire to excite the armature and power the regulator (12 gauge red wire) and a 14 gauge gray wire and a 14 gauge brown wire. one of these runs the idiot light and i think one is a down stream volatage sensor for the regulator (to compensate for system voltage drop after the fuse block) problem is i have no clue which is which, i think brown is traditionaly the idiot light wire but i dunno, i only work on older chevrolets as project cars and BMW's for a living, this thing is off a caddy that was so smashed i didn't even know what kind it was, somebody please help me

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Old 02-11-2005, 08:10 AM
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How about replacing that monstrosity with a 100W Spark-O-Matic like I have. Only cost $100 and that includes 4 speakers! And only draws a few amps. Rush Limbaugh and my ABBA CDs come through crystal clear!!
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Old 02-11-2005, 08:21 AM
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alt

brown is idiot light
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Old 02-11-2005, 11:44 AM
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i thought thats what it was, in that case problem solved i just hook the red and gray wires to the power output terminal and cut the brown wire off right? the idiot light is alreday hooked up to my other alternator....and by the way i used to have one of those rampage audio head units with 100watts and 4 speakers, didn't like the way it sounded and the 75 lbs of subwoofers (2 audiobahn ALUMX) and 35 lbs of box, amp, capacitor over the rear wheels really helps traction, especialy with my 75 shot of N2O
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Old 02-11-2005, 12:43 PM
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more power

I always add a battery for more power not an alternator. Yes you can cut the brown wire off or install a voltmeter.
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Old 02-11-2005, 02:06 PM
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More weight for traction? Now we can talk!! Saves having to stuff my rear bumper with lead.
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Old 02-13-2005, 10:02 AM
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well i tryed wiring it the way i thought it went and guess what, no output. now i found out on my nova that if you look at the stock voltage regulator brown is the excitor wire.....i guess ive gotta rewire the alternator untill it works, good thing i took extra harnesses of of several donor cars. any sugestions as to how this thing works would be appriciated. and by the way, i did add a second battery as well, its just on a different circuit because i could not find an affordable alternator that could run my car and my system so i split them. hey, this is more functional then lead too
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Old 02-13-2005, 09:23 PM
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which wire?

Of the three small wires on the plug, the center wire is the one you want to turn the unit on, red is for voltage sensing from inside the vehicle, you can hook up the large red wire if you want, but is not needed to make the unit function. Hope this helps. broken wire
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Old 02-14-2005, 03:11 PM
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Well i finaly got that turd to work, the brown wire was the exciter wire all along, the gray wire is for an idiot light and the red wire also requires power but now everything works so im happy. thanks for your input guys.
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