ALTERNATOR WITH EXTERNAL REG. TEST????
Having some problems with the charging ciricuit in my '77 3/4 ton 4x4 with auto. Have checked grounds and added extra ground straps from battery to firewall, frame, body. New alternator (best rebuild sold by Advance Auto), regulator, and battery. When have on all pwr hogs (lights, heater, etc.) come to idle speed, everything goes dim. With lights off only get about 12.9v at idle in neutral. When switch everything on voltage drops to 12.3 or less. Have checked connnections on the amp guage and they are tight and clean. Ohmed out wires between voltage regulator and alternator, they look to be good.
I have done the "open field test" on the new alternator. When I start up the engine the voltage reads at about 14v to 14.6v. I have to rev engine to get the voltage up above 15 and it will slowly go up to 16v. Should the voltage in this test mod go directly to 15v or better at idle(in neutral) without having to rev the engine or wait for it to build up. I'm thinking I got a lemon alternator from the parts store???
Problem started when son went 4 wheeling with a battery with one shorted cell and covered engine with water and in turn fried alternator. Anything else to look for??
Thanks for help on earlier post and for any help here.