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A new observation. The alternator charges mucho better when the engine is cold...


When the engine is cold usually coincides with the alternator also being cold - and the hotter the alternator gets, the lower the output.... same is true for the wiring. You really need to check the connections and take some readings with the multi-meter. Yes, the regulator and/or diode/triode rectifier pack could break down or degrade with heat.

Charlie's suggestion of brushes is also a good one.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum