Quote:
Originally Posted by Jack Zimmerman
An alternative to the relay to shut the power off to the alternator when in the trailer or in storage is to use a Cole Hersee P/N 75912 double pole battery disconnect switch. The main battery cable gets wired to one pair of terminals and the alternator field cable to the battery goes through the other pair.
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Jack, I used to use those on all my builds ,but in recent years I and several of my customers experienced switch failures . .that prompted my switch to the relay which has been very reliable. The 75912 switch is US made now [previously it had been being made in Mexico] and is rated at 750 amps intermittent load . Some of the 4 post type switches that that are being sold by Jegs ,Summit and others have smaller gauge secondary terminal posts are only rated for a 30 amp load and will not survive the output from the alternator.