brake/charge light on + high Idle . .. Hello ,im new here and if anyone could give me advice would be great ! My trucks brake/charge lights just both came on and my truck idled very high @ 2000 rpm or so . i know that usually means your alternator is (out) so i took it to get tested and it was BAD - installed the new one and things worked great after , two weeks later both lights are back on and truck is high idling again . . . got the new alternator tested twice and its good - installed new RED TOP , battery terminals ,cleaned ground and checked all fuses and still the same issue .

maybe a short ?? bad connection ?? not to sure seeing as the truck was running great prior . . . only has 51,000 original miles (1984 EX CAB) 4wd . . . . .any help would be great ! thanks much

 

just installed a new voltage regulator and things are running great again !

 

The EXACT SAME THING happened to me...turned out my battery was low on water.