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Old 06-19-2011, 08:52 PM   #1 (permalink)
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Question batteries

Just purchased a second hand sierra, there is a small motorcycle sized battery fitted at the moment, i was just wandering wether or not you can put a regular car sized battery in sierras or if they have to have the smaller batteries?
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Old 06-19-2011, 11:31 PM   #2 (permalink)
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You can put whatever will fit and is 12 volts. Heck, you can mount another battery on the other side if you want even more battery power.
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Old 06-20-2011, 12:16 AM   #3 (permalink)
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thanks for the info, ive got the battery out of dads prado, so ill use that one, so they run dual battery systems fine then?
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Old 06-20-2011, 12:12 PM   #4 (permalink)
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Yes, but I'd probably invest in a bigger alternator first. There are kits for 100+ amp GM alternators available and I've also seen rewiring services to bring the stock alternator up to 120 amps.

If you actually need dual batteries, you'll probably need the bigger alternator to recharge them in a reasonable time. I believe the stock alternator is around 30 amps which is plenty for stock, but once you start adding lights, winches, compressors,..., rapidly becomes overloaded.
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Old 06-20-2011, 06:17 PM   #5 (permalink)
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any sites you would suggest to check out some larger alternators then?
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Old 06-20-2011, 10:44 PM   #6 (permalink)
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https://www.suzuki-forums.com/suzuki-...r-samurai.html


Writeup on gm 7127 alternator;
Samurai – Installing a 100 Amp GM Alternator | iZook - Suzuki 4x4 Tech Information, Accessories, Travel & Adventure

I've done a lot of business with LowRangeOffroad;
Suzuki 1.3L and 1.6L GM Alternator Swap Bracket
Samurai GM 78 Amp Alternator Kit (Without Bracket)

Never dealt with thse folks, but they rewire a Samurai alternator to put out 120 amps;
Suzuki Samurai High Output Alternators
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Old 06-21-2011, 12:30 AM   #7 (permalink)
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the high output alternators seem abit expensive especially when you add on the cost of shipping, however the 78amp GM dosnt look to bad though, so if you buy the Gm alternator and the GM swap bracket is that all you need to swap them? Also i am waiting for a reply email from a guy i saw sells alternator kits for sammys when i searchd the archives of the forum i think his put out around 100amps which would be nice also, are alternators hard to change?
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Old 06-21-2011, 01:11 AM   #8 (permalink)
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The cost of rebuilding my stock Sami alternator was about the same cost as the purchase of a new GM alt...difference was the bracket needed to install the GM. The rebuilt was ofcourse, just reinstalled on the OEM brackets.
My battery guy tells me that my yellow top Optima will be adequately recharged by the stock alt...it will keep up with occasional use of my 6000# winch. The only question is what other electric draws u have on ur battery.
Some say the stock Sami alt that comes with the A/C option is larger capcity. Don't kno that for a fact.
Some say the use of a larger GM alt will also rob the 1.3 of some power.
Any battery will likely start the little engine...it's what else u make it do that makes the difference. Be careful taking ur 4x4 offroad with an old battery...they will usually quit according to Murphy's Law. Don't ask me how I kno.
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Old 06-21-2011, 07:53 AM   #9 (permalink)
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I've read a few posts about the 80 amp Grand Vitara alternator being a drop-in replacement with only the pully needing to be replaced.


A bigger alternator may pull an extra horsepower which would hardly be noticeable, but the extra rotational mass may slow down the throttle response even more than the actual power hit.

The stock alternator will charge any battery combination you are likely to fit in the Samurai. It's just that a larger alternator will recover the battery(s) from a heavy draw sooner. If you are running heavy loads often, then you need to calculate what the loads are and see if the stock alternator or the replacement will keep up.

It's ironic that my motorcycle (Honda GL1800) has more cylinders, displacement, power, and a much larger alternator than my Samurai.
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Old 06-21-2011, 04:56 PM   #10 (permalink)
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most likely all that it would be running is the car stereo a camp fridge and some lights, soo would this be a problem for the stock alt? also i know you can buy small solar panels the have leads to charge car batteries so would this also help take some stress of the alternator? i mean u use the solar panel while the car is not running to charge the second battery while it is running the camp appliances
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