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Old 12-17-2011, 04:45 PM
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alternator info needed

Whats the plus and minus of more or less amperage on an alternator?
I need a new one. I see some are 110(stock) amp, others are 160 or 200 amps. Why would I want one over the other?
thx
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Old 12-17-2011, 04:59 PM
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It's low 100s IIRC. 105? Or 130. Heck idk.
Higher ones will handle more electrical equipment better. But don't go too high cause your wiring was designed for a certain amperage.
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Old 12-17-2011, 05:03 PM
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I looked on eBay, they had 160 and even a high amp 200. Advance autos is advertised at 110. I guess that's enough. I am not running rad stereo equipment or anything. The high amp can damage wiring ?
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Old 12-17-2011, 05:07 PM
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I have the Duralast one. Lifetime warranty, and I know I'll be replacing it eventually
Just a regular stock one should be fine, even for a little bit of extra stuff.
Yea, if you try to shove too much electricity through a wire too small, then it will heat up and can melt.
Like if you have a pipe rated for 80PSI and you upgrade your pump to 120PSI, then you'll find the weak pipe really quick.
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Old 12-17-2011, 05:13 PM
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I just read that higher amp won't hurt anything cause the alt will produce to what the draw is, high voltage alt,s can melt wires. My alternator,I just put in my wife's truck. Hers died. It produced 11.7 volts at idle. Mine was 14.3 at idle. She needs her truck tomorrow, so I need to get on in the morning.
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Old 12-17-2011, 05:21 PM
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Well both can too. Either way, if there's not a whole bunch of extras on it, I'd go with stock. Especially if it's a lifetime warranty.
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Old 12-18-2011, 02:50 PM
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My alt is on the way out and i do a lot of plowing and was wondering if i should just get it rewired to a high output? how much? and will it hurt anything the rest of the year?
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Old 12-18-2011, 04:28 PM
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all the alternator does is recharge the battery... if you run high amperage items (winch, plow, stereo, extra lights, pull trailer with electric brakes) all those run off the battery and will drain it... the alternator then will sense the low voltage of the battery and turn up its output to recharge the battery... and as the battery gets charged the output will then lower itself to just what is needed to maintain the battery.

So if you have lots of draw on your batteries then get a bigger alternator.. of not the stock will be fine...
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Old 12-19-2011, 05:26 AM
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fwiw, i believe the dbelectric alternatores are reated for amperage at a lower rpm for the diesels. the parts store alt i have on mine now its 130 amps at 6k rpm. 52 at idle. so at 2k rpm probably 80-90 amps? fwiw.

db's i think is rated at 1600 rpm. if you plow a lot i would look into one of those, even if its stock amperage, it will charge the batteries more quickly and allow for shorter depletion time, fewer and lower % discharge.
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