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Old 22-08-2011, 09:59   #1
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Perko Battery Switch

I have one of these in my boat, four position rotary switch, installed in 1987.
How can I tell if it has an automatic field disconnect feature built in? When I look at the wiring I see the usual heavy wiring from the batteries and to ground but also two light wires going to I don't know where. All comments appreciated.
nial
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Old 22-08-2011, 10:12   #2
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Re: Perko battery switch

Quote:
Originally Posted by nial View Post
I have one of these in my boat, four position rotary switch, installed in 1987.
How can I tell if it has an automatic field disconnect feature built in? When I look at the wiring I see the usual heavy wiring from the batteries and to ground but also two light wires going to I don't know where. All comments appreciated.
nial
There will be a small brass nut and stud on the back, much smaller than the other three. If I recall it takes a #10 ring. It should be marked "AFD" or "Field Disconnect" or something to that effect. This terminal breaks/disconnects slightly before the OFF position does so the field to the regulator is cut before the battery/load is disconnected.

You can also get around frying the diodes by wiring the alternator direct to the house bank so it always sees a load. It is wise to fuse this wire close to the battery though if doing this.
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Old 22-08-2011, 10:15   #3
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Re: Perko battery switch

Yes, the two smaller terminals (F1 & F2) are the AFD switch, wired to the Alternator or Regulator.
http://www.perko.com/images/catalog/...603INS1%29.pdf
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