I'm looking to add a cut off switch to my 1999 XJ Sport and will be looking to bypass one of the fuses in the box but am not certain as to which one to choose.
I saw a fuse diagram for a 2000 XJ Sport on this forum and am figuring it might be pretty similar to my truck's fuses.
The fuse diagram had fuse #10 as a 15A "Starting System", it also had fuse #11 as a 20A and that one was for Pwr ControlModule/Auto Shutdown Relay/Fuel Pump Relay.
My question is which one is best suited for the cutoff switch that will be used to prevent theft and if there are ramifications of using one over the other? My thought is to use #11 since it would be shutting off the fuel pump relay, can adding a switch to this fuse that will be frequently turned on and off cause problems to the relays or fuel pump? Thanks in advance for any replies.

 

Either one will work but...

If it's really worth stealing, it's gonna just disappear.

 

Thanks and yep I agree, but if it's one of those spur of the moment things and I can make it harder it may make a difference.

 

Look in Summit or Jegs for a Race Car main power switch they are very HD and all of mine have been mounted at the rear bumper. There are all kinds of ways to mount it but it is a bit of a large lever on them for quick shut-off.


They take battery cable ran to the switch as it kills everything in the system. I have hidden a few of them on my Street/Strip cars then at the track I flag where the switch is at for the Safety Crew in case of emergency.


This is the fastest way to shut-off everything at once in case you have an accident, fire (electrical/gas), engine, fuel pump zero power nothing runs.

 

I'd hoped I could disable the TCU so they could start it and fail to go anywhere. Unfortunately the AW4 always goes. The ground from the fuel pump relay to the puter' might let them start it, but not be able to go....This would let me hear them, call the law, while they were thinking they are close and trying to figure it out.