Positive Ground questions
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Fleet Mechanic
Joined: Sep 2015
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From: Nebraska
Positive Ground questions
A 1955 F350 239 Y block is positive ground correct? So.....I'm working on my truck, trying to get it started, and while doing some research I found this out. Will this "fry" any of my electrical components? Could this be the reason I can not get the truck started? I know I'm an idiot for putting it in backwards but it had not been run in over 20 years and the cables appeared to be set up for that configuration. The truck has been turning over and I have spark in all but cylinder #8. Any words of advise would be greatly appreciated. Thanks in advance.
Lead Driver
Joined: Jul 2011
Posts: 6,599
Likes: 34
From: Rockingham, VA
A 1955 F350 239 Y block is positive ground correct? So.....I'm working on my truck, trying to get it started, and while doing some research I found this out. Will this "fry" any of my electrical components? Could this be the reason I can not get the truck started? I know I'm an idiot for putting it in backwards but it had not been run in over 20 years and the cables appeared to be set up for that configuration. The truck has been turning over and I have spark in all but cylinder #8. Any words of advise would be greatly appreciated. Thanks in advance.
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Fleet Mechanic
Joined: Sep 2015
Posts: 1,412
Likes: 123
From: Nebraska
@Joe The cable ends were set up up for negative ground. (6 volt) The thing is my dad put new cable in way back when and I am not sure they are right. I think I might be best to go get new cables that will put it back to positive ground. I just didn't know if hooking it up in reverse would affect the ability for the engine to start.
Phantom of the Phorum
Joined: Jan 2011
Posts: 5,472
Likes: 1,696
From: Kentucky
Connecting the correct size battery backwards won't hurt anything. These things are so simple it will only effect the charging.
Are you getting good strong spark on the other seven cylinders? If so, and it is in time and has decent compression, it should start. A fuel problem perhaps?
Are you getting good strong spark on the other seven cylinders? If so, and it is in time and has decent compression, it should start. A fuel problem perhaps?
Lead Driver
Joined: Jul 2011
Posts: 6,599
Likes: 34
From: Rockingham, VA
@Joe The cable ends were set up up for negative ground. (6 volt) The thing is my dad put new cable in way back when and I am not sure they are right. I think I might be best to go get new cables that will put it back to positive ground. I just didn't know if hooking it up in reverse would affect the ability for the engine to start.
What have you done to troubleshoot the firing problem? If only #8 has no spark, it could be the rotor cap or plug wire.
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