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Guest 2110A Universal Mount Marine Battery Selector Switch with Alternator Field Disconnect

I bought this last year and am finally putting it in. I have an older Horizon and need help trying to wire the AFD 14 gauge wires. I am installing two batteries so I can use one for starting and the other for the radio and other accessories while anchored.

Direction say to wire to "isolator" or to the "alternator". Getting confused.

4.3 Cobra engine. Hopefully the pics will post and you can see what I'm working with. I know I can just not hook up these wires but would like to have the benefit of the AFD.

Please help and please be patient, as you are dealing with a VERY challenged marine electric moron.

Thanks and have a great day!!!

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1992 Horizon 190

I looked online for a soft copy of the installation instructions - no luck.

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2007 Horizon 200
4.3L GXi/ SX 225 HP