Mitchman,
The wire leading to the relay is usually a lower amperage circuit and the safer one to "switch". The relay is actually a secondary electronic switch
that takes a small signal, sets, and then passes a higher power (amp) flow of electricity to the next device in line, in this case the pump. Sounds
to me like the EFI relay would have the same end effect by preventing the car from starting.
If you have a friend with some automotive electrical knowledge or can find a shop that specializes in auto electrics they should be able to help you
find the right wire to disable your vehicle.
A couple of cautions:
1. Use a strong enough switch to handle the voltage and amperage for the circuit. My auto expert friend told me a horror story about a young woman
who had a shop put in a kill switch - that switch was too "light" to handle the volts/amps and it short circuited, killed the engine while she was on
the freeway - she died in the ensuing accident.
2. If I forget to reset my kill switch and crank the engine I sometimes get a warning light, I checked the codes and it is the fuel pressure low
code. It usually resets after two or three restarts. Needless to say, I'm much more careful about resetting the switch after a few of these
episodes. The first time it happened was down south of El Rosario and I was pretty nervous, new truck and all, not knowing what the light was for.
On the pressure switch question - I have never used one, I just put my toggle switch in an out of the way place. The kill switch just makes the car
harder to steal, not impossible. also remember that you need to be able to conveniently set and reset the switch without being too obvious in case
the car thief is watching you as you park.
I also have a commercial starter interrupt system by KARR alarms that operates by an extra key fob. Their new systems are more sophisticated and I
believe they only sell through new car dealers. Two systems might be "over kill", no pun intended, but it just helps me sleep better when I'm parked
in suspect areas, either side of the border.
[Edited on 6-29-2010 by MitchMan] |