battery / alternator ?
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Junior User
Joined: Mar 2003
Posts: 67
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battery / alternator ?
What is the cause if the engine stops running when the negative battery cable is removed from the battery?
I also have voltage from the removed negative battery cable and the negative post when the ignition is off. I know this refers to a short somewhere.
I also have voltage from the removed negative battery cable and the negative post when the ignition is off. I know this refers to a short somewhere.
Elder User
Joined: Dec 2006
Posts: 550
Likes: 1
From: Hillsboro, OR
Generally, when the battery cable is removed, the alt. is supposed to keep the truck running so I would say bad alt. Any auto parts house can test it for free. As far as the voltage goes, you should have a little for the clock, radio, etc. The parts house can check this at the same time. Hope this helps
Fleet Owner
Joined: Jan 2008
Posts: 26,898
Likes: 3
From: southern md
yeah I was fooled b that also-you will see a negative drain when truck is off-as animalistic said for the clock e.t.c-if you pull the battery cable and she dies you got a alternator problem-9 out of 10 times!!!
Posting Guru
Joined: Aug 2007
Posts: 2,026
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From: Belle Mead NJ
If you want to ck for draw just take a test light and put it inbetween the neg cable and the neg post. If the light is bright you have a draw, if its dim its normal. But a parts store will be able to tell you if its the alt or an electrical problem. I had a bad ground and the alt wasnt charging enough, so after running for like 20 min when you turned it off it wouldnt turn on, if it did it was real slow.
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Junior User
Joined: Mar 2003
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Yup, the alternator did the trick. I still have 12 v between the neg cable and the battery. But I haven't driven it in a couple days and went out and it statrted right up with 12 v on the gauge. Please let me know if there is another problem maybe.
Thanks again.
Thanks again.
Elder User
Joined: Dec 2006
Posts: 550
Likes: 1
From: Hillsboro, OR
Originally Posted by 95F350XL
If you want to ck for draw just take a test light and put it inbetween the neg cable and the neg post. If the light is bright you have a draw, if its dim its normal.
