'75 F-250 Ignition problems
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'75 F-250 Ignition problems
I have a problem with a 1975 F-250 4x4. I was told that the starter was bad (its a work truck) so we replaced the starter. Then we replaced the voltage regulator, solenoid, and even the ignition switch itself. I don't know a lot about these older fords, does anyone know if there is a fusible link or an inline fuse somewhere that might keep this thing from starting? (One of the guys I work with jumped the solenoid and he got it to turn over.) I looked at the fuse block and the fuses are all good.
Elder User
Joined: Mar 2008
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maybe your neutral safety switch....on the side of your tranny, there are wires....you should be able to cut the 2 red/black(i think) wires and twist them together and see if it starts.....this is what is done to mine.....not sure if your switch is column or tranny mounted though..
Cargo Master
Joined: Sep 2003
Posts: 2,110
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From: southwest pa
there is a fuseable link somewhere in there. i cant remember where exactly though. i think its somewhere downstream right after the starter solenoid.your going to have to figure out where your not getting power though.
MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
It takes fuel, spark and compression to make a motor run. Make sure you've got fuel going to the carburetor, and then make sure the coil can fire. To check for fuel, open up the air cleaner and look down the throat of the carb and pull the throttle back; you should see two small streams of gas shoot out onto the venturis in the throttle bores. There are some quick yet rather unsafe ways to check for spark but you can get a spark plug tester from most parts stores that will let you see the spark as you crank the motor over. You need to perform step-by-step diagnosis instead of throwing random parts at it in hopes that it will randomly nail the problem.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
The NSS is on the steering column thru 1977, on the transmission 1978 and later.
While all 1976 and later F100/350's have ignition modules (brain box), some 1974/75's with 360/390's do not.
While all 1976 and later F100/350's have ignition modules (brain box), some 1974/75's with 360/390's do not.
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Junior User
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there is a fuseable link just off of the starter soleniod located on the passenger side fender, it is attached to the solenoid on the battery side of the solenoid, if you trace the wires from that side it should be about 8-10 inches from the solenoid laying on the fender its sometimes black and is about a 1/2 wide "bump" in the wire
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Still nothing
Ok, sorry I didn't get back to all of you, work work work! I appreciate all of your responses. Ok, here is what I have. There is power when the ignition switch is in the "ON" position, radio, lights, etc. When I turn the key to "START", nothing! I lose all power. I jumped the solenoid, and it will turn over, but I didn't hold it long enough to try to start it, as it has been since last fall since it was run. I pulled the instrument cluster, and looked for andything out of the ordinary, loose/broken wires, etc. Nothing. I took the module off of a running vehilce, same make and year, and nothing, no help there.
UPDATE!! UPDATE!! UPDATE!!
I just got the truck started by jumping the solenoid, and it continued to run until I switched off the ignition, but it still won't start on its own normal methods.
UPDATE!! UPDATE!! UPDATE!!
I just got the truck started by jumping the solenoid, and it continued to run until I switched off the ignition, but it still won't start on its own normal methods.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Pull the wire off the 'S' terminal of the solenoid, and use a test light or multimeter to verify voltage on the wire cap when the key is turned to START. It'll be easiest if a friend helps you, unless you use a clip-style test light.
Posting Guru
Joined: Jan 2009
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Like ND said, you NSS is on the top of your steering column near the floor. It works by a "pointer" that moves with the gear selector that pushes on the NSS, sometimes the NSS can get bumped out of alignment. It's usually the last think some people check as well, I spent a whole afternoon trying to figure out why my truck isn't starting, turns out my gear selector was broken and wasn't pushing the switch into "on".