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Old 12-09-2014, 09:38 AM   #1
svynx
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'03 Lifted TS

Default high amp draw question

I am building an 03 impreza ts into an off roader. There will be a winch mounted on the front of it. Currently I'm looking at two winches. One has an amp draw of 160, and the other has a draw of 178. Trying to figure out the logistics on the electrical system. I have no idea what the stock alternator can handle. Will it be ok, or should I change it out with something else (suggestions?)?
Additional draw items would be headlights (retrofitted HID), 2 HID pencil beams, 2 LED light bars, hardwired 500w inverter, trailer lights, heated seats
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Last edited by svynx; 12-09-2014 at 10:09 AM.
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Old 12-09-2014, 11:26 PM   #2
Uncle Scotty
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you should get a high output one....irrc the highest stock output one is 120A

there is at least one company that rewinds the stock ones to make more
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Old 12-10-2014, 06:03 PM   #3
2006whitesti
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Contact mechman alternators. Tell them Dustin told you to call. No way any oem unit is going to support any where near that amperage.

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Old 12-10-2014, 10:14 PM   #4
rkramer
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Your alternator doesn't need to put out the amperage of the winch. First of all, that is full stall current. Chances are you load a winch up that much its going to rip its mounting points off, there isn't really much of heavy duty box frame to mount to. Second, the battery supplies the current, the alternator just recharges it after the fact.

As far as the rest of your items, I'd watch out for the inverter. 500w isn't too bad, but fully loaded, it is going to take 40 amps constantly, which is far worse than intermittent winch use.
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Old 12-11-2014, 08:40 AM   #5
svynx
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'03 Lifted TS

Default

Thank you all for the help. I'll check out a few of the aftermarket alternators.
rkramer: I too was thinking along the same line with the winch (side note: it will be mounted using the Gorilla off road bar) as far as the intermittent use. It wouldn't be used that much. I hadn't considered the amp draw would be a maximum. And I wasn't too worried about the light bars. They should total about 350w. And thank you for the note about the inverter. I doubt it would ever be fully loaded, but it's good information. Knowing all of this, would a 160-180A alternator be ok, or should I oversize it?
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Old 12-11-2014, 11:35 PM   #6
Uncle Scotty
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I had a jump box that had a 400w inverter built in with 2 110v sockets...had a trouble light and air pump and a 12v lighter socket in it, too...one of the bloody most marvelous $125 pieces of kit I ever saw...
it DID weigh about #30 but worth its weight in gold out in the boonies at nite...with the gremlins a gremmelin

ill KILL the ass hole that stole it from me if I ever figure out who it was

Last edited by Uncle Scotty; 12-11-2014 at 11:48 PM.
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Old 12-16-2014, 11:04 AM   #7
svynx
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'03 Lifted TS

Default

Mechman quoted me $600 for their alternator. Maniac said they don't make high output alternators anymore (at least not for these cars). I have two local shops that make custom alternators. The first, who has a great reputation in our area, said that they can't be made and anyone who says differently is giving false information. I'm waiting to hear from the second shop. I was told that the Forester alternator, which is rated at 90 amps vs the impreza's 75 amps will bolt in.
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