01WS6/tamu

iTrader: (37)

On my s-10 I am using complete 04 truck front accessories and the pcm and harness are programmed for an 02 f-body. Will the f-body pcm be able to control the truck alternator correctly. The truck pcm controls the alternator much the same way although through a different terminal. I disgarded the stock charge light in the dash the voltmeter is all I need idiots need lights. Thanks

G-Body

iTrader: (4)

What terminals are used on your alt? I thought all LSx alternators used terminal B (the charge indicator wire that goes to the idiot light, or the PCM or the 500ohm resistor)

And that the trucks and vettes also used terminal C (goes to IGN + voltage)

Do you have a wiring diagram for the 2004 truck alt? I`m at school right now so I don`t have any diagrams with me.

01WS6/tamu

iTrader: (37)

Well I looked it up on alldata and the pcm controls the alternator on terminal b which is the field duty cycle. But it also showed brown terminal c coming from the truck pcm for the chg indicator. I guess I'll try it wo the chg lam connection and see if it will charge the f-body does not use this wire just the field control wire.

01WS6/tamu

iTrader: (37)

Anyone else know if the truck alternator will charge wo the idiot lamp communication to the pcm.

G-Body

iTrader: (4)

If the diagram for a 2004 looks like this I believe you need the second wire.

Mikkofin

iTrader: (2)

So both B&C pins at the alternator are fed with 12V for charging?

G-Body

iTrader: (4)

Kind of, pin C is fed 12V directly from the ignition whenever the key is on (IGN +). Pin B is fed 12V, but it is fed through a resistance source (either a light bulb or a resistor). You MUST have either a light bulb or resistor between pin B and the 12V IGN + source or you will quickly burn out the regulator in the alternator.

Mikkofin

iTrader: (2)

What kind/size of resistor should I have between pin B and IGN +12V source? 500Ohm?

I need to test this as my alternator only begins to charge after 1000rpm on the engine (with standard truck pulleys) with only the Pin C connected to +12V.

G-Body

iTrader: (4)

Some people say 500 0hm, but radioshack does not carry 500 ohm resistors and the factory GM diagrams show a 470 ohm resistor anyway. Either will work.
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