1990 Ford F-150 Ignition switch problems

Tiny
COONER1
  • MEMBER
  • 1990 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 94,600 MILES
The switch doesn't work at all in acc mode (turning back) If you turn it "on" position, nothing happens until you turn it all the way over to start. When you let go, it springs back like normal but cuts the truck off. Now I can't get it to into gear without cutting off the truck. Would the problem be in the switch housing? I replaced the switch and still had the same problem.
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Tuesday, December 1st, 2009 AT 1:57 PM

8 Replies

Tiny
BIGJIM79
  • MEMBER
It sounds like you are a ecm problem of some sort. Take multi tester and check your acc fuse and see if its getting any power.
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Tuesday, December 1st, 2009 AT 2:19 PM
Tiny
COONER1
  • MEMBER
Where is it at? I looked at the panel, no listing. I also looked at the original owners manual and it does not list one except for a super duty. Thanks for your help.
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Tuesday, December 1st, 2009 AT 2:57 PM
Tiny
BIGJIM79
  • MEMBER
OK HMM? There is relay under the hood on the drivers side that runs the starter and fuel pump start up. Try turning key on and testing the leads that go intot he relays as it may be a blown fuse link which is filled with a conductive ink. If its blown it will be swelled up or there will be a black or red die around the area.
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Tuesday, December 1st, 2009 AT 5:44 PM
Tiny
COONER1
  • MEMBER
I can get the truck to run but everytime I try to put it in gear, the truck cuts off like I don't have the key turned on. Also, while the truck is running, the defrost will not operate. As soon as the truck cuts off the blower runs on the defrost.
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Tuesday, December 1st, 2009 AT 8:48 PM
Tiny
BIGJIM79
  • MEMBER
This is a ECM fault. It has lost it memory as what to do to which signal. I would try and get the codes and try taking the neg. Batery cable off. Im sorry but it seems to computer related. I'll look more at my books and try to get better answers for you.
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Wednesday, December 2nd, 2009 AT 12:54 AM
Tiny
COONER1
  • MEMBER
Thanks for your help. I willtry this.
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Thursday, December 3rd, 2009 AT 12:15 AM
Tiny
COONER1
  • MEMBER
I got the truck running but the ignition switch still cuts it off by barely moving. I got the truck into gear, cut off. I started it back up and hit the tilt and as soon as the wheel moved up, cut off again. I took the negative off but can't get it anywhere to check for codes yet.
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Thursday, December 3rd, 2009 AT 2:03 PM
Tiny
BIGJIM79
  • MEMBER
This helps alot. The switch is grounding out somewhere on the column. Look for a bare or chafed wire around the switch area.
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Thursday, December 3rd, 2009 AT 9:19 PM

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