Alternator Light come on at higher engine rpm's

[SolarImages]

Run down of what i have done.

1. replaced batteries about 12 months ago (cleaned all connections)
2. replaced regulator 18 months ago (cleaned molnex connector on back off alternator)
3. cleaned anything else i can find and added electrical connector grease.

Problem i have now is running down the road at around 45 mph the alternator light come on at a glow, more so if i turn on the headlamps. Now this only happens above 45 mph.. so i am thinking brush? or maybe another connection i have missed or maybe i need to reopen the molnex connector and check it again? thanks for the help.

[M Wehrman]

Belt tight?

[Stekay]

Belt tight?

That was my first thought as well

[Jim LaGuardia]

Try worn brush or broken/frayed wire at back of alternator or Molex connector.

[Jimm391730]

I have seen alternators (not Pinz alternators) where the slip rings were not concentric with the shaft; the brushes would follow the ring at lower rpms, but bounced so much at higher revs that it would not charge and the alternator light would come on then.

This might be the case with your alternator, but the bad news is that it really requires a new rotor (meaning replacement alternator) unless you can have the rings turned true. Hopefully you'll find something else that is the cause.

[SolarImages]

Thanks all for the input just got home from a work run going to dive into this morning will post again later the results after i check all of your thoughts

[SolarImages]

Well checked all the above the fan belt seems a bit loose but now i have to figure out how to adjust it doing research now as i don't see anything obvious is it like a vw with shims?

[Jim LaGuardia]

Yes, you move the shims like a VW.