Painless harness (alternator wiring) question
09-14-2006, 02:14 PM
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Painless harness (alternator wiring) question the painless harness i just got does not seem to have a plug on it for the alternator. does anyone have any info on how i need to wire the thing up?
09-14-2006, 09:26 PM
#2
painless didn`t include a plug? What year computer are you running? If it is a 98 you will have to add in a light or resistor. If it is a 99+ computer there should be a red wire in connector C2 (blue connector) pin #15 on the computer that goes to the weatherpack connector pin B on the alt. 
09-15-2006, 12:03 AM
#4
The alternator hookup depends on the year, 97-98`s are like old SBC`s, the alternator exciter wire connects to an idiot light, or a resistor. In PCM`s that sre 99 or newer the computer acts as the resistance source for the alt. exciter wire.
09-15-2006, 12:44 AM
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Originally Posted by G-Body
painless didn`t include a plug? What year computer are you running? If it is a 98 you will have to add in a light or resistor. If it is a 99+ computer there should be a red wire in connector C2 (blue connector) pin #15 on the computer that goes to the weatherpack connector pin B on the alt.it didn't come with a plug on it nor can i find a wire for it in the harness anywhere. i also don't have a spare plug to use but i'll make due just for now with some creative work with small spade connectors. i found a site that said that there were two wires that needed to be connected.
let me know if this is correct (from the site modified for easier understanding):
looking down on the alternator in the car, we'll call the 4 pins starting from driver's side A,B,C,D. A and C are unused. B gets wired to switched 12v with either a 50ohm resistor or a small light bulb in line. D gets wired to constant battery 12v per their instructions.
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09-15-2006, 11:45 AM
#11
If the alternator is from an 02 f-body you only have one wire to worry about. The power for terminal D is already sourced internally in the alt so no external wiring is needed. Terminal B needs a switched ignition source either wired through an idiot light for the dash or a 470 Ohm 1/2 watt resistor. If you can get the search to work LS7Power has wiring diagrams, but I can`t seem to find the link right now. There is also info in this thread https://ls1tech.com/forums/showthrea...ght=alternator
09-15-2006, 05:40 PM
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you guys are life savers! thanks!
car started right up after i got the air out of the fuel system and is charging nicely. i ran two 220ohm resistors i had laying around in series so i think 440 Ohms should work ok.
car started right up after i got the air out of the fuel system and is charging nicely. i ran two 220ohm resistors i had laying around in series so i think 440 Ohms should work ok.
