I spend most of my time on this board on the OBS and NM forums. I disable my 96 7.3 from starting by pulling fuses 9 and 2 from the under hood fuse box on the drivers side. I'm trying to help a buddy w/ a '03 7.3 figure out how to disable his engine in a similar manner. Are the same fuses pulled to kill the engine on a '03? Thanks for any help.

 

Go after the fuel pump, i dont have a manual in front of me but the fuse is inside the truck. 20amp

 

Fuse #30 I believe

 

powrstrkr, I just sent you a PM with everything you need to disable it and also how to build a simple theft deterrent device. The parts will run you less than 5 bucks at Radio Shack.

 

Is that the IDM 'kill switch'? That is one of the best mods ever!!!

 

It's the one that Chris developed a few months ago from the 303 relay.

 

So do we call it the STD Mod??? LOL!!!

 

More like "keep the dirtbags from stealing your ride" mod.

 

TEXAS OUTLAW--can you please send a detail on your kill switch system to SOB Racing. i live in an area with alot of cockroaches which move at night. that would be greatly appreciated.

 

Thanks much Scott. I'll pass the info to him and prolly help him do the mod. A 97 was stolen locally and I posted it on the OBS and NM forums on this board.

 

Just re route the #30 relay and put a switch on the ground wire to prevent the Injectors from firing. It will just crank all day long, it's a pretty cool mod.

Here is how I did mine:






Oh, I cut a small notch out on the Fuse box cover to allow the wires to pass.

 

Ha, you just mentioned just about anywhere in this what to be a great country. With the exception of maybe Idaho and Alaska there is nowhere safe from the cockroaches.

 

Thanks for the roach control.

 

Hmmm that looks cool, might have to try that!

 

The idea of having to pull off the fuse dash panel and then the fuse box cover to remove Relay 303 (Injector Drive Module Relay) is a little inconvenient to say t he least. Especially, if you’re like me and want to disable your truck every time you shut it off. Here is an idea that I just tested and it’s simple, it’s cheap, its reversible, and it works. This Mod requires removing Relay 303 and relocating it just outside of the fuse box and installing a toggle switch for interrupting the relays ground connection to the fuse box.
You will need:
-5 male crimp-on blade connectors
-7 insulated female crimp-on blade connectors
-1 toggle switch (choose your style)
-At least 8 feet of 18 guage wire, or more depending on where you plan on mounting your toggle switch.
-1 small zip tie

-Cut 4 pieces of wire 12 inches long, crimp a male blade connector and a female blade connector on each end of the 4 wires.
-Locate the numbers on the relay near the blades, connect the 4 wires to the 30,87,87a,85 terminals.
-Attach the other ends of the 4 wires to the corresponding blade receptacles in the fuse box, where relay 303 was originally.
-Locate your secret toggle switch location, cut a wire long enough to reach from the toggle switch to the relay, crimp a female blade connector on each end of the wire.
-Attach one end of the wire to the toggle switch and the other end to terminal 86 on the relay.
-Cut another piece of wire long enough to go from the fuse box to the toggle switch, crimp a male blade connector on one end of the wire and a female connector on the other end.
-Attach one end to the toggle switch and the other end to the remaining open blade receptacle that blade 86 would plug into on the fuse panel.
-Carefully route the five wires toward the right of the fuse box and reinstall the fuse box cover, the fuse box cover may need to be notched to ensure the wires are not pinched when latched.
-Zip tie the relay to a desired location.
-Test
The first pic is a small version that was made to test with, you should get the idea though. These instructions were made very detailed so anyone could attempt this Mod no matter what their electrical skills may be. Hopefully this helps you guys! Good Luck!

Like I said, I DIDN'T write them but they seemed really great to go by. I see yours must have been grounded to the frame rather than running another wire back to the #86 terminal? Just noticed the differences...Thanks for your excellent pics..Dave