98 dodge ram, ignition kill relay

does anybody see a problem usin this configuration to interrupt the 2-12v constant wires on the ignition of a 1998 dodge ram diesel with a manual tranny. the customer does not want a starter wire kill, because the truck is manual. and if i interrupt the ignition 1 and 2 he does not want a theif to crank the starter over and over. he also does not want any switch put on the fuel pump.

how would i add another relay to this for both 12v wires.

would this be a reliable setup. do you think the relays could fail due to heat or continuous use like this. he doesnt mind carrying a couple extra in case one fails. i already warned him if it were to fail the car would shutoff.

any other suggestion are welcome provided they follow these:

customer does not want to carry any remote or key chain(rfid,magnetic...)

he does not want any type of alarm.

wants to be able to get in turn key to on, push a hidden button and start the truck.

also want it to enable as soon as he shuts off the key, he doesnt want to push a button after key shutoff.

thanks for the replies!

so that would only interrupt the starter wire right?

my customer doesnt only want the starter interrupted, because the truck is a manual tranny the truck can be push started.

i forgot to mention this truck was stolen before and recovered with the steering column busted.

after looking some more i dont think what i need to do is possible on the constant 12v wires. what if i intterupt ignition 1 and/or ignition 2 along with the starter wire( again owner does not want a theif to wear out the starter). can someone draw up a diagram for this using a momentary push button to ground.

another idea?

what if i use a add on remote start unit and remove the necessary wires from the switch and connect them only to the remot start unit.

when he gets in the truck he turns the key to unlock the steering and pushes a button to activate the start process, and drives away. there would be no connection to the hood pin or the brake. making the unit running all the time.

can a remote start unit run continuously like this, he sometimes drives for 12 hours at a time?

will this work without overheating?

i got the above to work on a bench, i just dont know how it will work under ignition load.

first turn the key to on, then push momentary button which engages ign 1 and 2 and allows switch to crank.

any other ideas???

i  used an ignition switch and harness from an acura legend on a bench with 12v buzzers on the motor side plug. my results:

when the key is turned on, nothing happens until the momentary switch is pressed, then the ignitions 1 and 2 stay powered until the key is turned off. then the whole thing is reset again. the only load on the ign 1 and 2 and starter are 12v buzzer or a meter or a test light.

i dont know how it will act in a car under current load.

but i did build this on a bench and it did work, my question is will this work in a car reliably?

owner did not want any remotes, and also did not want any fuel cut-off (someone else told him that his glowplugs will burn out if there is no deisel in the chamber). he likes to carry a single key without even a key ring.

anyway i installed the above relay set today, and it did exactly what he wanted. the key is turned to the run position and nothing happens till he pushes the hidden momentary button then ign 1 and 2 come on and the starter is allowed to crank. when the key is turned off the whole thing is reset.

thanks everybody for the advice.

the whole setup worked just like he wanted(so far). it was installed on monday.

the last relay on the left actually latches on the other three with 1 push of the button. so the 3 relays stay on the whole time the truck is running. and will not turn off until the key is turned off.

im thinking you mean that the button has to be held down during run and crank, but it doesnt.

if a theif jams something into the ignition nothing will happen until the "well hidden" button is pressed. even if someone uses the key and doesnt press the button the truck wont start. if you  look up into the underdash you wont see where i put the relays and all ignition wires were recovered in factory looking tape.

its actually a pretty cool setup unless a relay fails while hes driving, but he took a couple extra relays and understands the danger. i reccomend only starter kills, but hos truck is a manual so this is what he wanted.

thanks.