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How much current does starter motor draw? 

 

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 Post subject: How much current does starter motor draw?
Posted: Sat Aug 05, 2006 7:05 pm 
Getting Side Ways
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Anyone know how many amps the starter motor draws when turning the engine over? Reason I ask is I want to fit a circuit breaker in the bonnet (as the battery is in the boot), now I've got a cool Aepro one at work with a built in digital voltmeter, but it's only 120amps.

 

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Posted: Sat Aug 05, 2006 9:53 pm 
Getting Side Ways
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The current draw would be different for differing starters, loads, etc. You should pull the starter and check it's specs. All electric motors are required to have the specs on a plate attached to them. I can't see starters being any different. What ever the rating is multiply by at least 1.2 and that is your Max current rating.

 

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Posted: Sun Aug 06, 2006 6:42 am 
Tyre Shredder
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that might be the case on an ac motor but i havent seen one of these plates on a starter motor yet.

where a manufacturer will tell u that a starter motor will only pull 80-100amps they can and do spike to 200 on initial contact. depending on how sensitive your circuit breaker is it might not be big enough.

 

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Posted: Sun Aug 06, 2006 9:55 am 
Oompa Loompa
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Starters will draw more current as load increases, as tara said initial draw is very high. Go and see an auto sparky or anybody with a clamp ampmeter. That way you can check what your starter will draw without guess work.
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