Hello Folks. I've got a '79 CHEV VAN 20 series - camperized. Today wouldn't start after short run - dead battery , battery new 1 month ago. I had alternator tested on machine : max. current 33 Amp at full load ( rated for ~ 65 A ) I replaced alternator but I'm suspicious of Isolator + wiring to + from it. Alternator output ( hot ) wire goes to Isolator then back to original output wire ( isolator is an aftermarket conversion ). Another terminal on isolator runs presumably to Auxillary battery for lights + furnace inside, QUESTION : presumably isolator is a diode to prevent Auxillary battery from draining main battery i.e. allows current to go one way only to auxillary. HOW CAN I TEST ISOLATOR ? Isolator has tree terminals on it : from alternator ; back to splice into original alternator output wire ; to aux. battery.
I trust this long winded explanation is adequate. Please reply to NG. Thanks-
-JS