How many amps does a starter draw?

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Red
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How many amps does a starter draw?

Post by Red »

How many amps does a typical GM starter draw while cranking? I know this will vary on a warm vs cold engine and summer vs winter.
whipped
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Post by whipped »

Depends on the starter. Low compression I4 starters draw less current than high torque starters for high compression V8's. But I think 200 amps is a good round average number.
Red
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Post by Red »

The reason I ask is becuase my battery has been relocated to the front. Having a live wire running that long scares me. I'd like to put a fuse (one of those marine type) up by the battery. Need something sufficient for the starter, but will pop should the battery wire get chaffed.
whipped
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Post by whipped »

You can measure it yourself... Install the wire as-is, and measure the resistance from one end to the other. Have someone crank it while you measure the voltage drop from one end to the other. Current = V/R.
cactus bastard
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Post by cactus bastard »

How do you measure the resistance of the wire? Wouldn't you need to be flowing huge amounts of current before it even developes any measureable amount of resistance? :scratch:
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whipped
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Post by whipped »

yeah, I don't know what I was thinking...

calculate, not measure.

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p8ntman442
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Post by p8ntman442 »

OR look it up or call a starter/alternator place and ask them.



always gotta do stuff the hard way.
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MNFatz
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Post by MNFatz »

Summit racing has some really good relocation kits. The kits have the battery ends as well as some funky clear-covered braided hose. They also sell main junction boxes you can put right next to your battery to address the live wire problem.

That's what I'm running
Red
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Post by Red »

Got a link to what you're using for a main junction box? I found the relocation kits on Summit, but they don't have any kind of fuse. Thanks!
Kohburn
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Post by Kohburn »

all you want a fuse for is incase the cable gets chaffed and shorts out? time better spent keeping it from rubbing on anything conductive - fuses are a bad idea in the primary feed line IMO
The Dark Side of Will
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Post by The Dark Side of Will »

affirmative... GM doesn't even put a fuse in the starter wire on the stock wiring.

How much current can the starter pull? How much current can your battery supply?
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