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post #11 of (permalink) Old 08-30-2002, 10:46 PM Thread Starter
 
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Re: dual battery/alternator

Okay, I know you're right about this, but I know zilch about wiring up a dual battery system (mechanical iso-what?) Can you point me to any other info on the web (say, with pictures and parts list?) about doing this? If I can see it, I can do it.
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post #12 of (permalink) Old 08-31-2002, 02:53 PM
 
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Re: dual battery/alternator

Do a search, there have been a few good threads on the issue. This was from a post a while ago, made by TR (I think):



</p>
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post #13 of (permalink) Old 08-31-2002, 04:19 PM
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Re: dual battery/alternator

Bluseman2a's got an excellent description of building a dual battery tray. Click on the image...

<a target="_blank" href=http://www.atlanta-off-road.org/6/ubb.x?a=tpc&amp;s=995606763&amp;f=122608034&amp;m= 8006094701></a>

See, now you got a start... you know about the tray and the wiring. All ya gotta do is hook everything together and you've save about a bizillion dollars for more Jeep mods!

Last edited by LEVE; 03-24-2009 at 07:45 PM.
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post #14 of (permalink) Old 08-31-2002, 06:20 PM
 
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Re: dual battery/alternator

LEVE, how do you make images clicky? Something like this:

{url}{image}www.imageurl.com{/image}{/url}

(change the {} to []) ???
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post #15 of (permalink) Old 08-31-2002, 09:47 PM
 
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Re: dual battery/alternator

I also bought an alternator on ebay from the guy Weakenedmchnix mentioned, and it's worked great. The one I bought was sold as "180 Amps" I seriously doubt it actually puts out that much, but I can run all the lights plus electric fans and still stay above 13 volts, I would drop down to 11.5 with the stock one.
It's a Delco-Remy alternator re-wound with bigger wire. He uses NTN bearings and includes an adapter to make it plug right into the stock harness (you do have to replace the stock output wire with 2 AWG) I think I paid about 130 for the black powder coated unit.
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post #16 of (permalink) Old 08-31-2002, 09:59 PM
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Re: dual battery/alternator

AllLockedUp, you're very close.

Here's the code that permits the Battery Tray picture (above) to be clicky:



Rememer that you're viewing the above as all one line... no carriage returns!

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post #17 of (permalink) Old 08-31-2002, 10:16 PM Thread Starter
 
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Re: dual battery/alternator

Thank for the absolute wealth of information on this... I think I may be able do this myself. I'll have plenty of time to think it over though.... My Weber carb just showed up yesterday and I'll be knee-deep dealing with that in the immediate future,, along with the TFI ignition upgrade I'm doing. I'm sure I'll have some questions...
Thanks again...
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post #18 of (permalink) Old 09-01-2002, 04:39 AM
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Re: dual battery/alternator

1. Why is the oil pressure switch tied into the second battery?

2. Batt #2 will not charge unless Solenoid #2 is energized, right?

3. Solenoid #2 should be rated for 200Amps continuous because it's now two batts, right?

Thanks,
Chris
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post #19 of (permalink) Old 09-01-2002, 11:16 AM
 
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Re: dual battery/alternator

Hey, not my schematic but I'll give it a shot:

1. Oil pressure switch connects the second battery only when the engine is running. If the engine's off, then the second battery is isolated. When I wire up mine (just have them parallel for now) I'll probably use a voltage sensor/relay in place of that switch. That way, if the engine's running but the alternator has stopped charging, then the seconda battery still can't be drained.

2. Correct.

3. Sol. #2 only carries the load of 1 battery.
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post #20 of (permalink) Old 09-03-2002, 04:57 AM
tys
 
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Re: dual battery/alternator

Oh I got ya, so when the engine is running, the oil pressure switch energizes the relay, thus allowing the electrical system to benefit from dual batts, as well as allows batt#2 to get charged at same time batt#1 is. Replacing the switch with a sensor of somesort, to detect alternator failure, would be key. Then you could run yourself on Batt#1 till it dies, then use Batt#2, and hope you could make it home or to an autoparts store by then...

Chris
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