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Is my starter drawing to many amps? #5192126 08/20/19 01:41 PM
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joegreen Offline OP
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I have a mid 70s winnebago on a Dodge cb300 chassis. It has a 360ci engine. The engine is turning over slowly. The battery is new and resting voltage is around 12.8v. when cranking voltage drops to 11+v volts and quickly recovers to 12.5v when stopping cranking. I checked the amp draw of the starter with my amp clamp and it's drawing 375-400+ amps when cranking over slowly. That number seems awfully high to me. Does it sound like my starter is bad?


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Is my starter drawing to many amps? [Re: joegreen] #5192140 08/20/19 02:04 PM
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Chris142 Online Content
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Sounds real high to me.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Is my starter drawing to many amps? [Re: joegreen] #5192185 08/20/19 02:37 PM
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ragtoplvr Offline
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That is kinda high. That is a Chrysler gear reduction starter, and they do not crank the engine fast anyway. They would however crank a stubborn high compression 440 in the winter. fast enough to start.

Rod

Re: Is my starter drawing to many amps? [Re: Chris142] #5192186 08/20/19 02:38 PM
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Rob_Roy Offline
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Originally Posted by Chris142
Sounds real high to me.


x2. Assuming all of the connections check out good (including engine/chassis/battery grounds) I would replace the starter.


2016 Ford Expedition EL Platinum
2016 Ford Expedition XLT
1999 Ford F350, V10
Re: Is my starter drawing to many amps? [Re: joegreen] #5192208 08/20/19 03:02 PM
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Eddie Offline
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+1 check all high current grounds first.


2014 CX5 Touring 2.5L :-)
Re: Is my starter drawing to many amps? [Re: joegreen] #5192227 08/20/19 03:25 PM
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user52165 Offline
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What gauge are the cables? Most are barely minimum. Increasing to a 2 or o gauge with a new starter should work better. No experience with Mopar, but replaced many SBC with high torque gear reduction types.


Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy. It's inherent virtue is the equal sharing of misery.

Winston Churchill.
Re: Is my starter drawing to many amps? [Re: joegreen] #5192412 08/20/19 07:14 PM
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joegreen Offline OP
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I broke the main cable stud on the starter so it will be getting a new starter regardless if it needs one.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Is my starter drawing to many amps? [Re: joegreen] #5192427 08/20/19 07:27 PM
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Eddie Offline
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+ a new HD cable I hope. Ed


2014 CX5 Touring 2.5L :-)
Re: Is my starter drawing to many amps? [Re: joegreen] #5192522 08/20/19 09:12 PM
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oldhp Online Content
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Make sure your grounds are good and clean connections too. Battery to engine.....Engine to cab.....Battery to frame.


"None of us are getting out here alive.....drink that beer.....eat that pizza......drive that Hot Rod"
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"I don't run...........I just wait"
Re: Is my starter drawing to many amps? [Re: joegreen] #5192544 08/20/19 09:41 PM
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No need to replace the cable if the starter is bad, it can wait. If it were the cable involved too, the amps would be lower rather than higher than expected.

On the other hand, considering the vehicle age, sure i'd take a close look at the cable and if it needs replaced, go for a lower gauge.

Last edited by Dave9; 08/20/19 09:42 PM.
Re: Is my starter drawing to many amps? [Re: joegreen] #5192602 08/21/19 12:44 AM
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I measured my likely original 1989 318 starter draw Peak at close to 1800 watts, which would be 180 amps at 10 volts DC.

A new starter is rated at 1.4KW or 1400 watts, that is the output.



Re: Is my starter drawing to many amps? [Re: joegreen] #5195982 08/25/19 06:42 AM
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joegreen Offline OP
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I was working on the rv at my parents house but that project is on hold for now as i cant get there for a long while. Thanks for everyone's input.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Is my starter drawing to many amps? [Re: joegreen] #5198080 08/27/19 01:37 PM
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George7941 Offline
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I hope you did not measure just the initial peak draw of the starter because that will be 400 amps or higher.

Originally Posted by Dave9
No need to replace the cable if the starter is bad, it can wait. If it were the cable involved too, the amps would be lower rather than higher than expected.
True dat..


2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.
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