Hi Peter,
Did some shop do your T-belt, and then say all is OK? Or did you do it?
Is there a new S-belt? perhaps the tensioner is weak and the belt glazed or stretched. Possibly slipping under load.
The other thing I wonder is how many amps load you are putting on the alternator?
The stock alternator is 100 amps, NOT 100 watts.
That would be about 1400 watts max.
You're not running a high power amp for a stereo by any chance?
You can't run more than 1400 watts with a 100 amp alternator.
The cable between the starter and alternator has to carry all the current to keep the battery charged. Cable ends are first to get dirty and /or have the crimps
die from old age and corrosion.
See 14.0 VDC at the battery with everything on and engine running to relax.
Bill
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