SmokinBBC
Well-known member
When the 2003 Expedition idles the lights dim and brighten randomly. I checked the alternator. At idle it would charge at 14.2 and drop a little to maybe 13.9 and then pop back up to 14.2. It sometimes drops to 13.5 or 4ish and then pops back up. So I put a new alternator in..........same shit. I put in a spare battery....same problem. RPM's remain constant about 800rpm when the problem happens.
I replaced the belt. Old one had about 60k on it and still looked good. Tensioner looks like it is ok. No slipping/etc.
As far as I can tell, it only does this at idle. Lights don't dim while cruising.
Checked all the grounds fuses, electrical connections in the engine compart etc.
I have the wiring diagram...what is the best way to hunt down the problem? I almost feels like a large random draw...like the AC compressor cycling on/off....but the AC is not running.
:sos:
I replaced the belt. Old one had about 60k on it and still looked good. Tensioner looks like it is ok. No slipping/etc.
As far as I can tell, it only does this at idle. Lights don't dim while cruising.
Checked all the grounds fuses, electrical connections in the engine compart etc.
I have the wiring diagram...what is the best way to hunt down the problem? I almost feels like a large random draw...like the AC compressor cycling on/off....but the AC is not running.
:sos: