2001 Ranger won't turn over, even with jumper cables
Posted in the Ford Ranger Forum
#1 Jan 6, 2010
Just get a click with the key. With cables connected I can't even get a spark with the negative jumper on the engine block, but the lights in the cab are on as bright as can be.
#2 Jan 6, 2010
Brian, the battery clamp could have rusted. You see, there is two wires at each clamp. The bigger ones go to starter, and that contact must be really, REALLY good. Try battery terminal cleaner, or better clamp if you had to kludge the old one. Car electronics don't draw much current and run of separate cable. But starter draws more than 100A of current and it takes 0.12ohm of contact resistance to drop 12 volts all the way to zero at 100A.
The other possibility is that battery got internal short. That may explain that jumper cable doesn't help. Try to disconnect you battery and start the truck with external only. Once again, make sure that the contact is really good and jumper cable is in good condition.
There is always possibility of rusted terminal at the starter, or even starter gone bad (they do go bad once in a while, although ranger starters are pretty good and the problem is with rusty terminals most of the time).
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