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 Post subject: 2 batteries or 1?
 Post Posted: Sat Nov 22, 2008 10:56 pm 
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Joined: Wed Nov 19, 2008 12:02 pm
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Location: Alabama
Just about got my truck finished and am wondering should I run 2 batteries or just one with an alternator or both with an alternator. If I do run 2, what is the best way to connect them? :-k


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 Post Posted: Sat Nov 22, 2008 11:04 pm 
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what kind of truck/ what are you using it for?

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 Post subject:
 Post Posted: Sat Nov 22, 2008 11:30 pm 
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Sorry, guess some info would've helped. Its a 93 s10. Drag race only with a 434 small block.  All the electrical will be is the MSD, fuel pump, fan, and trans brake. No nitrous. Dont know if that helps or not but thats all that will be using the power.


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 Post subject:
 Post Posted: Sun Nov 23, 2008 8:14 am 
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one battery no need for the extra, also keep weight down. just use a good starter.

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 Post subject:
 Post Posted: Sun Nov 23, 2008 8:49 am 
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1 battery with a 1 wire alternator works good, saves fooling around with a charger at the track. ;-)

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 Post subject:
 Post Posted: Sun Nov 23, 2008 11:10 am 
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Location: Alabama
Ok. 1 battery sounds alot cheaper. BUT, my next question is will the alternator keep it charged with the limited amount of time the engine is running?


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 Post subject:
 Post Posted: Sun Nov 23, 2008 11:25 am 
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I've got an Optima red top and I can go all day (5 runs or so) and still have enough to run without charging or an alternator. I'll charge it for a couple of hours (low rate of charge) and its good for the next day as well.

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 Post subject:
 Post Posted: Sun Nov 23, 2008 12:08 pm 
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Location: Elizabethtown, KY
We put an red top optima in when we first built it in 84. run an alternator and the battery stays fully charged. I throw the charger on it once a month and it shows fully charged. I put a larger pulley on the alt so you have to rev it a little for it to kick on.

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 Post subject:
 Post Posted: Sun Nov 23, 2008 12:36 pm 
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I was planning on going with optima anyway but you guys have pretty much sold me on the red top. =;  =D>


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 Post Posted: Sun Nov 23, 2008 3:01 pm 
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I run a regular group 24 battery because that is what was in the car when I bought it almost 3 years ago.  I think what matters most is HOW YOU MOUNT IT cuz if it’s mounted wrong then it won’t last a season in a car that leaves hard!  With the Optima though I don’t think it makes any difference but iff’in you’re just getting ready to mount the battery box, then I’d mount it so that you could run a “cheap” battery if you had too!

I run a 70 amp alternator and a Moroso 30% UNDER DRIVE pulley on the crankshaft!  I've never had any problems with it to date.  

I also have the race car battery connected to the truck charging system whenever the car is in the trailer.  That way the battery gets charged both going to the track and coming home after an outing.

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 Post subject:
 Post Posted: Sun Nov 23, 2008 4:17 pm 
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I run a pair of optimas without an alternator.  With a high compression engine and a trunk mount battery I think you need 2 even with a charging system. Make sure you use a heavy gauge battery cable because you lose some amperage with a long cable anyway.  If you go with 2 just hook each negative to a good chassis ground and jumper the positives together. Another good reason to use a gel-cell like an optima or orbital is they don't leak. No matter how you mount a lead-acid battery there will be some slosh with a hard leaving car and that spilled acid is very destructive. To me a gel-cell is worth the difference in price just because of the fact that you won't have any damage from the spilled acid.

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 Post subject:
 Post Posted: Sun Nov 23, 2008 6:30 pm 
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Also the optima doesn't give off a gas when charging.

Ken I was thinking of hooking my trailer battery for the winch and interior lights like that. How did you do it? Is it a stright wire hook up or did you put a diode in it?

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 Post subject:
 Post Posted: Sun Nov 23, 2008 6:50 pm 
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WR169 wrote:
Also the optima doesn't give off a gas when charging.

Ken I was thinking of hooking my trailer battery for the winch and interior lights like that. How did you do it? Is it a stright wire hook up or did you put a diode in it?




Steve I did that to mine also but don't hve it hooked to the car battery. There should be an "extra" heavy black wire in your connector. just run at least a # 10 wire to the truck battery and I put a 30 amp circuit breaker  in line with it. So you can charge you trailer battery wile your driving to the track =;

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 Post subject:
 Post Posted: Sun Nov 23, 2008 7:17 pm 
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Sounds like a plan. Thanks.

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 Post subject:
 Post Posted: Sun Nov 23, 2008 7:25 pm 
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Yeah Steve, Like Barry says, put a circuit breaker in the line next to the battery then run that 10ga wire to the plug because without the circuit breaker you'll burn that wire up when you start the tow vehicle.  With the circuit breaker in the line, it will "unload" the wire when you start the truck.  

On mine I come out of the trailer plug and go to a battery inside my trailer that powers the alarm system and the winch.  I got a pair of wires coming off that battery and they connect to wires under the front end of the car that are connected to the charging system.  I've done this to every car I've ever towed, even have this setup on my open trailer that I towed the first Camaro with.  Works as slick as your finger in your nose!  ;-)

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