voltage drop after 2 to 3 hrs of heat

[2001tahoe2025]

2001 Tahoe sat for abt a yr or 2 with voltage drop issue. I rewired the usual rear of engine block wire , made it heavier, Rewired a heavier wire to frame form Battery and added another to the alternator, It would still drop to 9volts and then stall after abt 2 hrs. You could see the voltage on dash board meter.
Had to reconnect battery to get mileage reading for PA state registration and noticed there was only about 1/4 inch of insulation removed from heavy positive wire running to fuse box assembly , where it was inserted into compression clamp for the positive battery terminal. Not enough, so i trimmed back another 1/2 of insulation, greased it with dielectric grease from harbor fright and then shined up the clamp innards, and compressed both heavy wires going in . Tightened it very well and then connected it to battery.
SO far s good ,, it ran for 2 to 3 hrs in the driveway with no failure. Revved the engine up numerous times to abt 3000 rpm, and it still had no issues.
It was a very warm saturday when I did this., and it usualy failed in that kind of heat.
I am optimistic that this action took care of the chronic voltage drop problem.
Engine has 127K mi on it.
Will keep you posted !

Pete

 

[2001tahoe2025]

I found only 1/2 in of insulation removed from the heavy red wire coming from the fuse box to the battery.
Not enough! trimmed off another half in of insulation and shined up the wire and the + battery clamp. Greased the connection , tightened and reconnected to battery.
The engine has now surpassed the 3 hr hot run time mark.
I am now confident it was a metal expansion issue at the + battery clamp that was my problem.

I am a happy camper now !