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Slow Cranking - Starter AMP Draw
#1271932
07/22/12 01:51 PM
07/22/12 01:51 PM
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Joined: Apr 2003
Posts: 1,286 Ft. Lauderdale, FL
solarguy
OP
pro stock
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OP
pro stock
Joined: Apr 2003
Posts: 1,286
Ft. Lauderdale, FL
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I'm troubleshooting a recent slow cranking speed situation and am looking for Starter amp draw numbers. Car has 340, Turbo-Start mopar resto yellow cap battery, DB electrical mini starter, Heavy duty battery cables, clean terminals. Battery and starter are about 18 months old.
With my d/c amp probe clamped around the positive cable and cranking with a remote starter switch, I am measuring 235-248 amps. That seems high off the top of my head but I actually have no data plate to compare it against. Before I go have the battery load tested, does anyone have any "Normal" amp draw numbers.
Thanks
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Re: Slow Cranking - Starter AMP Draw
[Re: RapidRobert]
#1271935
07/22/12 04:12 PM
07/22/12 04:12 PM
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Joined: Apr 2003
Posts: 1,286 Ft. Lauderdale, FL
solarguy
OP
pro stock
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OP
pro stock
Joined: Apr 2003
Posts: 1,286
Ft. Lauderdale, FL
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I just got back from load testing the battery, print out shows 13.23 volts and 183 CCA , looks like 18 mth old resto battery is gone. I'm curious though why I was reading 235 or so amps and the load test shows only 183. I guess variable in load between their tester and my engine load??
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Re: Slow Cranking - Starter AMP Draw
[Re: solarguy]
#1271936
07/22/12 06:42 PM
07/22/12 06:42 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Current is determined by the load. Sounds like the starter is a bigger load than the load tester in this case. that or your meter is reading off.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Slow Cranking - Starter AMP Draw
[Re: Supercuda]
#1271937
07/23/12 12:53 AM
07/23/12 12:53 AM
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Joined: Jan 2003
Posts: 4,291 Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,291
Morrow, OH
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The current means little without knowing the voltage. What is the battery voltage when you are cranking it?
If the voltage is reasonable, measure the voltage from the negative battery post to the engine block to make sure you don't have a ground problem - - don't want much of a voltage drop there.
You would also want to measure the voltage at the starter and compare to the battery when cranking to make sure you don't have a bad connection in that circuit also.
I would not trust the battery test the store did. Measuring voltage and current when cranking is the best way to know, just make sure the battery is fully charged when doing the test.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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