Bad ignition switch or wiring problem? Autometer fuel and Painless Wiring

[canblue]

I am trying to shoot an old problem with my Autometer fuel gauge. When the key is in acc postion, the gauge reads 1/4. When I turn the key to start/run, the gauge reads empty. I am not a mechanic or skilled electrical person. I posted here as I think it is a problem with the ignition switch. Hoping for some direction on solving this problem. The gauge pegs when the sending wire is grounded. The ignition system is not stock, Crane HI-6 CD. Electrical is by Painless for Mopar.

Not really sure where to start.

 

[radical rob]

Sounds like a wiring problem. When you turn that key on that circuit is not powered. Need a 12 volt key on circuit. My 2 cents.

 

[kiwigtx]

I am trying to shoot an old problem with my Autometer fuel gauge. When the key is in acc postion, the gauge reads 1/4. When I turn the key to start/run, the gauge reads empty. I am not a mechanic or skilled electrical person. I posted here as I think it is a problem with the ignition switch. Hoping for some direction on solving this problem. The gauge pegs when the sending wire is grounded. The ignition system is not stock, Crane HI-6 CD. Electrical is by Painless for Mopar.

Not really sure where to start.

Definitely a wiring problem.

In ACC there must be a crossed wire which is adding some resistance to the fuel gauge circuit - thus giving you a partial read on the tank.

Please elaborate on 'gauge pegs' - is this FULL or EMPTY pegging, and is it instantaneous, or gradual movement?

 

[canblue]

Thanks for the reply. Need to make a repair plan for next spring. The weather is not cooperating for drive way repairs. Will collect all the information that I can. The non OEM wiring adds to part of my confusion as most of the information is on the OEM harnesses.

Immediate peg past full.

 

[canblue]

Sounds like a wiring problem. When you turn that key on that circuit is not powered. Need a 12 volt key on circuit. My 2 cents.

Thanks. Will add info to my trouble shooting plan for the spring.

 

[radical rob]

Many of the aftermarket wiring harnesses have a problem in this area. Mopar ignition switch has 7 terminals if I remember right, and new harness has less wires. Trying to connect the last terminals can be a swearing and head scratching few moments