| [GMCnet] 4-post isolator [message #122335] |
Tue, 19 April 2011 11:49  |
Richard Brown
Messages: 281
Registered: May 2009
Karma: 1
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Senior Member |
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I recently bought a replacement isolator for my coach & it has 4 posts instead of the normal 3. According to the instruction sheet, it is for the sense wire from the alternator. I've been wondering if I should hook it up to the alternator that way instead of how it is now. Would there be any benefit? Would it do similar to installing the APC on the alternator & would it provide an accurate indication of battery charge? It works fine as-is but it's something to consider...
Richard & Carol Brown
1974 Eleganza SE
"DILLIGAF"
Lindale, Tx. 75771
903-881-0192
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Richard & Carol Brown
1974 Eleganza SE
1174 Hickory Hills Dr.
Murchison, TX. 75778
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| Re: [GMCnet] 4-post isolator [message #122357 is a reply to message #122335] |
Tue, 19 April 2011 14:37  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Richard Brown wrote on Tue, 19 April 2011 12:49 |
I recently bought a replacement isolator for my coach & it has 4 posts instead of the normal 3. According to the instruction sheet, it is for the sense wire from the alternator. I've been wondering if I should hook it up to the alternator that way instead of how it is now. Would there be any benefit? Would it do similar to installing the APC on the alternator & would it provide an accurate indication of battery charge? It works fine as-is but it's something to consider...
Richard & Carol Brown
1974 Eleganza SE
"DILLIGAF"
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Richard,
In order of asking:
No
No
No & no
Not Really. . .
Don't bother with that 4th "sense" terminal. It is for twin engine boats that have two each more or less similar starting batteries. It is designed to select to the higher voltage so as not to overcharge the better battery. That is, if it is like those that I have been sold.
Your couch has the sense lead of the alternator connected to the start battery by a most circuitous but effective path. Connecting anything to that terminal will only confuse things that are pretty sure of what they are doing.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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