Help-Electrical!
Thread Starter
Advanced
Joined: Dec 2003
Posts: 99
Likes: 0
From: Galveston TX
Help-Electrical!
I started getting the following: charge system fault, high voltage, abs system, etc. and the guages and interior lights shut off momentarily. The dealer has so far replaced the alternator and ECM but can't figure out why it codes crazy. It runs great otherwise. Any ideas? 
Pro
Joined: Jul 2004
Posts: 689
Likes: 1
From: Media PA
If you have an intermittant connection and the connection opens you unload the alternator and may get "high voltage" indication. this may explain the lights going out. But where is the intermittant connection? this may be diffucult to locate. Any recent damage to vehicle? What is the age of car? Tough one. Good luck.
Drifting
Joined: Jun 2004
Posts: 1,887
Likes: 2
From: Havin' fun in Frederick, MD!!!
St. Jude Donor '05 '09
I don't know what's inside the ECU, but in most data acquisition functions, inputs (e.g. voltage values, etc.) are grouped to different input multiplexers or receivers. If these particluar signals are grouped (or are grounded) together, they could all be affected by a single open circuit inside the ECU (or a single ground associated with that multiplexer outside the ECU). If the device (e.g., multiplexer I spoke of) is bidirectional, it could also cause the loss of an output (e.g. instrumentation and interior lights).
Since you already replaced the ECU, then in my opinion, it is most likely a ground associated with this group of signals.
Since you already replaced the ECU, then in my opinion, it is most likely a ground associated with this group of signals.
Often, this symptom is associated with loose/corroded ground(s).
Thread Starter
Advanced
Joined: Dec 2003
Posts: 99
Likes: 0
From: Galveston TX
Tomorrow it's fixed, I hope.
Dealership called, said they know what's wrong. They think a wire from the replacement of the alternator is grounding against the satrter. I hope they are right. 
