pt2285

So I swapped to the LS3 for a few months now and I have a spear tech harness which has the pack connector into the alternator. I also have the single wire in my painless kit from when I had the SBC engine. So I plugged both in and ran it for past 3 months with no problem but little miles. Recently my voltage is jumping and running around 18.1 v and I’m seeing st the gauge and on my scan tool which is not good. So am I double feeding the system or did I fry the voltage regulator? Or do I just not have a wire jumping from the pack connector to the lug output to send signal to regulator?

clinebarger

What alternator are you running? LS3 doesn't mean anything......Too me anyway.

pt2285

stocker, AD case style. What we came with GM ACC kit.

clinebarger

I would run a "resisted" ignition hot to pin B.....Either through a incandescent bulb (Generator Lamp) or a 470 ohm resistor.

pt2285

clinebarger

The regulator "Senses load/voltage" from being connected to the Output/Charge post inside the alternator case, "CS" & "AD" series alternator can usually be "turned-on" using the LAMP terminal.

ECM/PCM control of the alternator can get complicated when your not using the factory alternator with factory ECM/PCM. Even then....No guarantee it will keep-up with high demand.

Here's the diagram everyone refers to.....

pt2285

So does it sound like I need to swap terminals and add a resistor or did I blow the regulator?

clinebarger

I would check the wiring & fix if necessary. Also make sure the charge cable is good & big enough.....I run at least a 8 gauge charge wire. Make sure the engine/alternator is grounded well.