Ok seeing as you have new ground straps, (everyone should know this), I
would take a booster cable and run it from the battery negative to the
firewall and see what happens.

If no change, I would then turn on the emergency flashers and see if a)
it starts with them on or b) it dies when they come on or c) they have
no effect.

There is one other place to check for a broken ground as well. Look on
the passenger side of the engine near the back for a bolt with 2 or 3
small black wires coming off it. This is the ground for the computer
harness.

Have you had any wiring issues or melts or bad electrical smells?
Anything like the 4x4 light stuck on or anything else unusual?

Mike

Mike Romain wrote:
>
> That should be a dead mesh ground strap from the rear of the engine head
> to the firewall.
>
> There is a 99% chance your vehicle is stealing the ground through the
> brake pedal and light circuit.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Glen Hudgin wrote:
> >
> > My Cherokee starts fine but as soon as I touch the brake pedal it kills the
> > engine. If I keep my foot on the brake pedal it won't start. I tried
> > disconnecting the wire to the brake light switch but if I do this it won't
> > start. The brake lights work fine and the hazard lights work so I don't
> > think the switch is the problem. Does anybody know what this problem is?
> > Glen