HEAVY DUTY BATTERY ISOLATORS For 12-36V DC negative ground electrical systems. Isolate each battery to prevent the battery with higher charge from draining into lower. Allow two batteries to be charged simultaneously from a single power source. Contains solid state, circuitry. Installation & wiring instructions included. (More isolators on the next page.) 90 AMP MAX ALTERNATOR 90 amp rating per leg, 2 legs. Three 1/4ö stud terminals. 6 1/2ö L x 3 1/4öW x 2 13/16öH