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Author
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Topic: Dual battery wiring ?
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steve'66
Gearhead Posts: 9104
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-23-2005 03:17 PM
   
I have two batteries for the trunk of the '66, same size, but one's a lead battery and the other is a Optima type spiral cell. Can I just wire them in parallel? If their charging rates are different should I have some kind of Isolator wired between them? Any diagrams? Thanks guys,SteveW
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Fastymz
Moderator Posts: 19583
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 01-23-2005 03:40 PM
Does this help,
http://www.sierrajeep.com/dual.htm------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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steve'66
Gearhead Posts: 9104
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-23-2005 05:37 PM
Ron,Yeah it does, thanks. I went ahead and fab'd up a dual battery tray. Worst case I'll have to buy another battery to match. Thanks, SteveW
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Dave_C
Gearhead Posts: 994
From: Gadsden, Al
Registered: Aug 99
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posted 01-23-2005 09:10 PM
Steve you will need to buy another battery. The batteries need to be the same size. Due to the amp difference the larger battery will always be pulling the charge down on the smaller one.I've done it, but it will cut the life of the smaller battery by about 1/2 in my experience. David Cole ------------------
557 BBF Powered, alcohol injected rear engine dragster. 4.90 @ 143 1/8 mile. 1.09 60'. I've got to be crazy to drive this thing.
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steve'66
Gearhead Posts: 9104
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-23-2005 11:08 PM
Dave,They are the same size, just different types. Still think I need to buy another? If so that's OK I'll buy another std. batt. and put two of the same type in each car.  SteveW p.s. The problem turned out to be the alternator. The 8ga charging wire was burnt off the alternator and the post was melted down. 
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Dave_C
Gearhead Posts: 994
From: Gadsden, Al
Registered: Aug 99
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posted 01-24-2005 12:06 AM
Hmmmm....never mixed types. I don't knwo if it woudl hurt anything as long as they are the both amp size.David Cole
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steve'66
Gearhead Posts: 9104
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-24-2005 11:27 PM
Thanks Dave,Anyone else have an opinion if I can run these two same size, different typ batteries in parallel with an isolator? If not, I'm going to do it. SteveW
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