Electrical problem involving ignition

Tiny
TAWS1961
  • MEMBER
  • 1990 FORD MUSTANG
  • 5.0L
  • V8
  • 2WD
  • MANUAL
  • 160,000 MILES
I replaced the key cylinder and ignition switch. Prior to doing this, my vehicle had no problems starting until the ignition switch fell apart. After putting new key cylinder and ignition switch in place, I attempted to start the car. When I turned the key to the run position, no lights came on in the dash, I turned the key to start the car, nothing happened. No power to ignition at all. I tested the starter solenoid, which is relatively new, and it was operating correctly. It would turn over vehicle using two large posts, and the screw post to positive post. I don't believe I'm getting power from the ignition switch electrical harness to the ignition switch. I've been told there may be a problem with a fusible link. Also, I don't know whether a faulty clutch safety switch would result in absolutely no power to the ignition switch. Please help!
Do you
have the same problem?
Yes
No
Wednesday, December 16th, 2020 AT 11:45 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

There are two yellow wires going to the switch that are spliced. Do me a favor, check to see if there is power to them. I attached a pic from the wiring schematic to help you understand why I'm suggesting this. Check them and let me know the results.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know if you have other questions.

Take care,
Joe

Was this
answer
helpful?
Yes
No
Wednesday, December 16th, 2020 AT 3:53 PM
Tiny
TAWS1961
  • MEMBER
Hello, thanks for the reply. I'm assuming the "spliced" yellow wires you speak of are right by the starter solenoid and enter a fusible link. Or, are the yellow wires part of the wire harness that plugs into the ignition switch on the steering column? I'm not real great at reading wiring diagrams. I know there is voltage entering the yellow wires from the positive post of the solenoid prior to reaching the fusible links. What I'm not sure of is if there's a hot connection from the wire harness that connects directly to the new ignition switch I installed (I think not). So, I think the connection is broken somewhere between the fusible link near the solenoid and the connection to the ignition switch.
Was this
answer
helpful?
Yes
No
Wednesday, December 16th, 2020 AT 8:16 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Looking at the schematic, it appears the yellow wires should provide power at the switch, so they should be hot. From there, the power is distributed via the switch.

Check for those wires at the switch itself and see if there is power.

Let me know.
Joe
Was this
answer
helpful?
Yes
No
Thursday, December 17th, 2020 AT 7:53 PM

Please login or register to post a reply.

Sponsored links