1987 chevy truck with carbed Lt1 alternator wiring - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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post #1 of 5 (permalink) Old 01-15-2010, 01:58 PM Thread Starter
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1987 chevy truck with carbed Lt1 alternator wiring

I got the motor and everythiung in the truck except I dont know how to hookup the alternator into the old wiring. I have the 3 wire connector from the donor car hooked to the alternator with a heavy red and 1 brown wire and black. Which ones do I hook to the older wiring?
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post #2 of 5 (permalink) Old 01-16-2010, 07:51 PM
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I think the LT1 altenator has external voltage regulator,traditional alt. have reg. built in(i believe) because i ran into the same problem when i put carbed LT1 in 86 camaro,i custom fabbed some brackets and used older alt. and switched pulleys cause lt1 pulley is wider than regular sb alt pulley.I jope this helps good luck
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post #3 of 5 (permalink) Old 01-16-2010, 08:46 PM
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If it's a CS144 alternator, then it has an internal voltage regulator.

Which alternator are you using? The LT1 setup only uses one wire (on a 4-pin connector) that goes through the gauges to the fuse block.

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post #4 of 5 (permalink) Old 01-16-2010, 09:22 PM Thread Starter
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mine has the 4 pin connector but it has 3 wires a red brown and black. how do i tell if its a 144?
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post #5 of 5 (permalink) Old 01-16-2010, 09:24 PM Thread Starter
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my old alternator had 1 wire but that was for the 350 tbi
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