06-13-2016, 08:40 AM
Join Date: Jun 2009
Total Cats: 0
How did I screw up my NB charging system??
I brought my 99 NB back to pseudo-stock and passed emissions. Charging was no issue, but I would see the battery light occasionally on very low idle. I was sorting through the A/C system and did the following operations:
1) Realize that I had left the evaporator plug apart - reconnected it
2) Checked the 2 A/C relays - plugged them back in
3) Plugged the cigarette lighter back in - was out from the last time I had the console off. I had to fish the connector out with my fingers.
4) Did several A/C runs - got the pressure where I wanted
All of these operations, I did with the battery still connected, because I'm lazy.
Somehow, all of this has eliminated the alternator's ability to charge.The battery light now comes on a few seconds after starting,
Battery holds 11.2V and falling. Same at the alternator post.
Changed to a new Advance alternator. Same story.
Swapped over to my Megasquirt that has a handmade alternator regulator - no charging.
Spent a little time polishing up grounds and adding an alligator clip to ground the alternator case - that did nothing.
I removed the engine bay fuse block and looked at the white wire - looked good, but I did not unscrew the main fuse yet and really inspect the white cable.
So - I think this means
1) It's not a blown voltage regulator in the stock ECU
2) It's not the alternator, unless I bought another bad one
I am guessing that there is maybe an open in the 2 signal wires from the alternator to the ECU?
Did there just randomly break? Should I run a continuity check back to the ECU?
Is there a way to bypass this ECU control - I guess not, without an NA alternator transplant?
Did I short a cell in the battery when I plugged in the cigarette lighter?
Did I break something in the signal wires? How?
What should be my next step?