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Registered
Join Date: Apr 2009
Posts: 42
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really dumb battery question !?
i never thought about this before but i was asked if my 74 911 is a positively or negatively grounded car. i have not put a battery in it yet so i went to look and it has a short red wire connected to the frame and then a black wire with three smaller red wire on the other side of the battery compartment. i guess i just assumed the short red wire going to frame was negative(ground) and other side (black wire with smaller red wires) was the positive side. i don't have a wiring diagram yet. sorry for such a basic question.
jim |
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05-01-2009, 11:27 AM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,483
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Negative ground. PO was just stupid to use a short red cable for ground! To make sure look at your battery. The post with the short red cable should have a negative (-) symbol on it.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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05-01-2009, 11:31 AM
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Join Date: Apr 2009
Posts: 42
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thank you. thats what i thought but it made me think for a second
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05-01-2009, 11:32 AM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,483
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Not a problem jkirby. The really dumb question would have started out with "I switched my battery around because the red cable was on the negative post so I put it on the positive post and now everything is melted. . ."
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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05-01-2009, 11:55 AM
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Join Date: Mar 1999
Location: Cornwall-on-Hudson, New York, USA
Posts: 4,499
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Just be absolutely, positively sure nobody trying to be helpful during a jump start hooks like to like colors with a jumper cable.
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Stephan Wilkinson '83 911SC Gold-Plated Porsche '04 replacement Boxster |
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05-01-2009, 12:18 PM
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Join Date: Feb 2005
Location: Mexico
Posts: 1,961
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Change the ground wire for a proper colored wire or a proper ground strap.
Just to avoid what FSW said, remember Murphys Law. |
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05-01-2009, 12:43 PM
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Join Date: Mar 1999
Location: Cornwall-on-Hudson, New York, USA
Posts: 4,499
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You could also wrap the exposed portions of each cable with red and black electrical tape as a cheaper and easier fix, but the Don is right: it needs to be corrected before the inevitable happens.
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Stephan Wilkinson '83 911SC Gold-Plated Porsche '04 replacement Boxster |
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05-01-2009, 01:17 PM
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