Se7en62
Adventure Seeker
Alternator/voltage regulator I'd say. Harmonic balancer doesn't fail quite like that in my experience- having it spin partially free would generate considerable heat and plenty of wear as the rpms increase. Not to mention noise. Alternatively- some fail and the pulley just falls off entirely.
With a multi meter- can you see any voltage fluctuations while at idle? You could have another bad ground elsewhere I think.
That's a good point. My multi-meter died, but I have a 12V voltage meter inside the cabin and it shows lots of fluctuation. It's over 13V while driving, but when at a stop and in gear it drops to 11-13V. Then If I put it in Park, it rises to around 13V. When I turn the A/C and radio off it bumps up to 14-15V. At any one of those points the voltage fluctuates by about .5V to .9V. I'll swing by Oreilly's on my way home and see if they can run their meter over it for more clues.
There is a section of the FSM that details the location of every ground in the whole truck. I’d check and clean each one. Do these lights flicker with the engine off?
I haven't paid them much attention when the truck is off, but I'll pay attention to them this evening and report back. - I want to say that they shine regularly when the engine is off, but I'm not sure. I've looked through Vol. 1 and Vol. 2 of the FSM and haven't found any list of grounds but I may have missed them. I'll look again...unless you know what page?