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Agree with steve for the checksI'd have a look at all the plugs on the reg/rec, there are 2 which on mine could come apart quite easily and any connector associated with the yelow wires, they carry a lot of current and the connector can fry as I rememberIt's also an idea to add an extra grounding strap from the reg/rec to a good solid ground.Otherwise I'd start as steve said with the AC output to Reg/Rec from the Alternator then check the DC output from the Reg/Rec. Remember to check the DC with a fully charged battery as a discharged battery can pull the voltage down
To check the reg/rec check for continuity between any of the leads ( 5 of them if I remember right ). There should be NO continuity between any of them. Also. there should be NO continuity between any of the leads and the case ( body ) of the reg/rec.
Look Ma, no brushes