Mystery problem
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Freshman User
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Mystery problem
When I go and start the truck 65' F100 with a 302. It's slow to turn over and the brake line going into the master cylinder gets smoking hot. I have absolutely no idea what is wrong. The battery has a good charge. Any thoughts?
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
That should not happen now way no how. Check the starter cable to see if it is touching something and has a skinned place on it. All of that should be over on one side and close together, so tracking it down shouldn't be a big issue.
John
John
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Freshman User
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Yes sir it's all in the same area. Should make tracking it down a bit easier. Thanks.
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I have checked all the grounds, they seem fine, all new cables. I took the battery in it checked out fine as did the starter, starter cable is fine. I checked all the brake lines and there is no electrical wire touching them. The new exhaust I had installed is not near any electrical. The problem seems to have started after I got the exhaust done. Still when I turn it over it drags and the brake line gets smoking hot. The mystery continues. 
Tuned
Joined: Feb 2014
Posts: 376
Likes: 4
Did the ground from the chassis to the cab get removed when the new exhaust put on , could be the electricity is trying to get to the cab from the chassis or vise versa from the easiest way it can and the brake line is a direct path. mine the neg battery cable goes to the exhaust manifold bolt and a ground strap from the back of the block to the firewall . make sure the negative is attached to the engine block for max current transfer to the starter .
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5th Wheeling
Joined: Sep 2013
Posts: 30
Likes: 1
From: Post Falls, ID
Agreed, probably a bad ground connection. Your steel brake line is the current's path of least resistance. Make sure your new ground cables are bolted to clean, bare-metal surfaces with dielectric grease.
Also, after you figure this out, make sure you bleed the brakes (you just inadvertently cooked the fluid in that line), and inspect the brake line for damage. It is arcing electricity between the steel line and its first contact point to the frame, and it has severely weakened the brake line at this point. Maybe even replace it even if you can't find any visible arc point.
Also, after you figure this out, make sure you bleed the brakes (you just inadvertently cooked the fluid in that line), and inspect the brake line for damage. It is arcing electricity between the steel line and its first contact point to the frame, and it has severely weakened the brake line at this point. Maybe even replace it even if you can't find any visible arc point.
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Tuned
Joined: Feb 2014
Posts: 376
Likes: 4
Glad you got it fixed , 70% or more of all automotive electrical problems are bad grounds , 20% or more are bad components and the rest (very few) are shorts in power wires ...you are likely to easily spot a short in a power wire because it will quickly melt and or catch fire . Bad grounds are like chasing ghosts on older vehicles .
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