Fuel pump kill switch

[Pigtrailrv]

I did a little more research on kill switch options. Interrupting the start button is intuitive and might well be the ideal solution but I'm a little nervous about messing with it because of potential complications with the remote start function and the RFID backup start feature. No idea if these are valid concerns.

Looking at the schematics, there were three circuits that seemed like decent alternates:

1) Fuel Injector power
2) Fuel Pump power
3) Starter solenoid power

For those intrepid enough to open up the wiring, all three circuits can be accessed under the PDC fuse board. There are four connectors that attach to the underside of the PDC fuse board:

Within each connector the pins are laid out in an 'A-B-C...' x '1-2-3...' grid.

Some info regarding each option below. Note that making mistakes is one of my primary features, so if proceeding, best verify the options using the schematics posted by @x7tristan here: [ Don't burn up that beautiful JL!! ]

https://www.jlwranglerforums.com/forum/threads/jeep-jl-wrangler-wiring-diagrams.19185/


1) Fuel Injector / Coil power
Connector C3, pin B4
Fuse: F70, 25 Amps
Wire size: 14 AWG (equiv.)
Wire color: Brown/yellow
Schematic: Fuses / Relay - ASD - [engine]

2) Fuel Pump Power
Connector C2, pin B5
Fuse: F04, 20 Amps
Wire size: 14 AWG (equiv.)
Wire color: Dark Blue / Orange
Schematic: Fuses / Relay - Miscellaneous [engine]

3) Starter Solenoid Power
Connector C1, Pin F2
Fuse F02, 40 Amps
Wire size: 13 AWG (equiv.)
Wire Color: Yellow / Grey
Schematic: Fuses / Relay - Miscellaneous [engine]


When opening the PDC on my '21 JLUR 392 I found that the fuses, connectors, wiring and colors appeared to match the schematics for the other listed engine platforms.

I haven't implemented a kill switch yet as I'm not 100% comfortable with hacking the wiring on a new vehicle, but if proceeding will probably lean towards the 'Starter Solenoid' option as it seems the simplest and least likely to mess with any computer monitoring or diagnostics. The down sides are that its a relatively difficult (short) wire to access in the PDC and that its fused for substantial current (probably requiring a 10AWG wire run with a beefy high amperage switch, or maybe a remote relay).

I took out the PDC and switched the Fuel Pump Relay and the starter relay but put the switch on the low power coil side of the relays. Connector C2 Pin A7 Fuel (dark blue .35 size) and Connector C1 Pin H8 Starter (Violet/Beige .35 size). Works great. Not hard to do, took a couple hours. Disconnect the battery. I have 2022 Wrangler Rubicon V6 Etorque

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[Left Field]

I took out the PDC and switched the Fuel Pump Relay and the starter relay but put the switch on the low power coil side of the relays. Connector C2 Pin A7 Fuel (dark blue .35 size) and Connector C1 Pin H8 Starter (Violet/Beige .35 size). Works great. Not hard to do, took a couple hours. Disconnect the battery. I have 2022 Wrangler Rubicon V6 Etorque

Thanks for trailblazing this alternative! I've been dragging my feet on implementing a kill due to the high current on the fuel pump and starter solenoid wires. I'd focused on those as they are simple low tech circuits and avoided any wiring that interfaced to the PCM (in case the signals were being monitored and would throw a code if interrupted by a switch). But your results show that breaking the relay control signals works - and much better than breaking into high current wiring.

 

[JAF1]

I took out the PDC and switched the Fuel Pump Relay and the starter relay but put the switch on the low power coil side of the relays. Connector C2 Pin A7 Fuel (dark blue .35 size) and Connector C1 Pin H8 Starter (Violet/Beige .35 size). Works great. Not hard to do, took a couple hours. Disconnect the battery. I have 2022 Wrangler Rubicon V6 Etorque

Any reason you did both relays? I was thinking of just doing the fuel pump relay.

Thanks!

 

[Pigtrailrv]

I used a Ravelco anti theft device that I took off an old vehicle. You can kill 2 circuits with it.

 

[Santana74]

I found that installing this kill switch was easy and effective.

 

[AZJeepGuy]

My tow package came with switches installed in the dash. Run a line there. Or,
Don't worry about it because you have insurance.

 

[BadA$$Rubi]

I took out the PDC and switched the Fuel Pump Relay and the starter relay but put the switch on the low power coil side of the relays. Connector C2 Pin A7 Fuel (dark blue .35 size) and Connector C1 Pin H8 Starter (Violet/Beige .35 size). Works great. Not hard to do, took a couple hours. Disconnect the battery. I have 2022 Wrangler Rubicon V6 Etorque

Just to clarify…
A7 is a positive (+)
H8 is a negative (-)

 

[Pigtrailrv]

Sorry, I don't remember and I'm out of town. Not sure it matters in this situation. You're just interrupting the circuit.

 

[LooselyHeldPlans]

Sorry, I don't remember and I'm out of town. Not sure it matters in this situation. You're just interrupting the circuit.

Any chance you could do a write up on this? I’m sure it’d benefit a whole lot of people.

 

[rickinAZ]

Dumb question: wouldn't a less intrusive approach to safeguarding one's Jeep be to use the Taser's new PIN feature?

 

[LooselyHeldPlans]

Dumb question: wouldn't a less intrusive approach to safeguarding one's Jeep be to use the Taser's new PIN feature?

Potentially. Probably more prone to a bug too. I lean towards a relay based system because if there’s a failure, atleast I can mechanically bypass it.

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