Starter cranks when shifting to reverse
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Junior User
Joined: Jan 2008
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Starter cranks when shifting to reverse
My boss has an 88 F150 with an automatic. When shifting into into reverse the starter cranks. Anyone seen this before or know what would cause it? Thanks for the info 
Fleet Mechanic
Joined: Nov 2003
Posts: 1,372
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From: West Cornwall, CT
This sounds like a wire chafing problem in the steering column. I would do a good visual check first.
If there are no obvious problems the next step is to take a wiring diagram and a multimeter to check to see where the starter voltage is coming from when in reverse.
Lou Braun
If there are no obvious problems the next step is to take a wiring diagram and a multimeter to check to see where the starter voltage is coming from when in reverse.
Lou Braun
More Turbo
Joined: Mar 2008
Posts: 658
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Yes, you definitely have a short in the steering column. I don't think I've ever heard of that happening like that though, pretty cool (in a strange sense....)
If it is indeed a chafing issue, replace the wires and wrap them in some of that plastic spiral warp or similar product to prevent against future problems.
If it is indeed a chafing issue, replace the wires and wrap them in some of that plastic spiral warp or similar product to prevent against future problems.
Post Fiend
Joined: Jan 2005
Posts: 8,402
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I seem to remember a similar problem on here a while back. If I remember correctly the neutral safety switch and the reversing light switch are incorporated in one unit in the trans and if faulty, can feed power to engage the starter when shifting to reverse. Maybe some of the electrical experts can confirm this.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
Does this happen when he shifts into REV with the engine running?
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Junior User
Joined: Jan 2008
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We actually figured it out yesterday. Column was unlikely due to the fact that the only wires running up are for the signals, hazards, horn and cruise. Found the neutral safety switch harness melted. Must have chafed and then shorted out. Having trouble finding a good harness though because one connector is shot. gonna have to do some digging. Thanks for the help, much appreciated.
