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  #1  
Old 10-19-2003, 12:12 AM
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Join Date: Oct 2003
Location: manila philippines
Posts: 15
Exclamation jump start went wrong

One of my customers, drives a an early 90's 560 slc w/ the 117 engine. anyway he left the lights on and it discharged his battery, so he proceeded with jumping the battery and doing a series with another battery. the problem was he did not notice that he did it REVERSING THE POLARITY. now the car started after they switched it correctly. but it now runs on high idle it runs on 2000+ RPM was this possibly the effect of accidentaly reversing the polarity? any ideas tnx
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  #2  
Old 10-19-2003, 08:25 AM
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Join Date: Jun 2003
Posts: 104
Could be something got screwed up, but it can also just be that the generator resistance makes the car idle higher until battery power is recovered. Will soon be down to normal if that is the case. Hope for the cheapest...
L.
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  #3  
Old 10-19-2003, 11:49 AM
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Location: Toronto, Canada
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Check all fuses, especially the one on top of the OVP.

xp
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  #4  
Old 10-19-2003, 11:29 PM
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Join Date: Oct 2003
Location: manila philippines
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Quote:
Originally posted by AMG CE 36
Could be something got screwed up, but it can also just be that the generator resistance makes the car idle higher until battery power is recovered. Will soon be down to normal if that is the case. Hope for the cheapest...
L.
yeah thats what i Thought too., so i replaced the battery with a new one and it still does the same.
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  #5  
Old 10-20-2003, 12:33 AM
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Join Date: Mar 2001
Location: Evansville WI
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xp190 I believe is probably correct. Check the fuse on top of the OVP (overvoltage protection relay). You'll see it back between the dual firewall area, it's a silver relay with a red piece of plastic on top, and also a flip open lid on top. Flip the lid open, there is a red spade type fuse under there, a red 10 amp fuse, I bet it's blown, this will blow if the polarity is reversed. It powers up the engine control module, it's running in fixed operating mode right now, which can give the high idle, poor cold starts, etc.

Gilly

(that is, if it GET's cold in Manila!)
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