1979 Ford F-150 Ignition module and ignition switch?

IN13PIECES

MEMBER
1979 FORD F-150

Electrical problem
1979 Ford F150 V8 Two Wheel Drive Automatic

Hi,

I have a 1979 Ford F150 with a rebuilt 400 V8 engine with about 7,000 miles on it. Everything has been replaced except for the starter, which is fine, to my knowledge.

However, I recently replaced the ignition module because the truck would continue running-- or cranking but not turning over-- even if the key was not in the ignition. After replacing the module it ran fine for about a week and then started having the same problem again. So, I've boiled it down to the ignition switch. Could that be the case?

The battery seems to be completely dead now, though I've been keeping it unhooked because the engine tries to crank every time I hook the battery back up. I've tried to hook it back up a few times to see if I can start the truck, but it drains almost immediately. I even burned out a set of jumper cables trying to jump it.

Do you think it's something other than the ignition switch? Maybe the module needs to be looked at again? The other problem is removing the switch-- I've removed the key barrel but can't seem to get the switch out. Any suggestions?

Thanks in advance.

2 Replies

DAVE H

MECHANIC
13,383 POSTS

I think it's probably the ignition switch .. ford have for a long time had a fault with these ? I don't know if this description will help it's describing the removal on a 85 model .. my manuals don't go back any further i'm afraid ?? hope it helps
Removal (Bronco, Econoline/Club Wagon, "F" Pickup)
Disconnect battery ground. Remove steering column shroud and lower column. Disconnect switch wiring at multiple plug. Remove nuts securing switch to steering column. Lift switch vertically to disengage actuator, and remove switch.
Fig. 2: Rod-Actuated Ignition Switch

Installation
With lock cylinder and switch in "LOCK" position, engage actuator rod in switch. Position switch on column and install retaining nuts, but do not tighten. Move switch up and down along column to locate mid-position of rod lash, and tighten retaining nuts.
Merry Xmas