I just impulse purchased this SpeedyEFI alternator control board to try and solve my no charging issue on my '99 as an alternative to swapping it to an NA alternator.

The car has a stock ECU for the foreseeable future I'm just been chasing this charing issue from bad connectors to bad grounds and I've landed on it being a bad regulator in the ECU or bad wiring between those points and I had just given up and was going to switch to a self-regulated alternator despite having a freshly rebuild OEM alternator I just dropped a few hundred on in there. In my forum crawling I heard some folks talking about control boards and found that SpeedyEFI one and did zero research and pulled out my wallet.

My rationality has returned to me and I'm realizing I have no idea what I'm going to do with that board when I get it. Is it even going to solve my issue, if it really is a bad ECU? Does it require one of their ECUs? If anyone has any resources on installing these I'd be incredibly grateful, I'm not an electrical engineer I just like banging gears and am desperate to get her up and running again.

 

It's all in the product description on the website.


Says where every wire goes. You'll have to pick +12V and GND from your stock ecu. Disconnect / Depin the wire from stock ecu (1T?) o FIELD input on your NB alternator. Same for the lamp wire(1G).

Look up wiring diagrams for your year.
No it's not ecu related, it's a standalone controller.