I have a f150 4.6 engine wont crank with key I have replaced cylnoind on starter and firewall safety nuetral switch battery ignition switch any other ideas

 

Main power wire for the starter. They corrode internally. Check it..

 

Will it crank if you jump the firewall solenoid?

 

Any noises what so ever?

Dang man, I'm working on one that won't quit cranking, - running or not lol. - Not good .

 

Yes I can jump it from the firewall

 

Dang man, how you been getting around, -the shoe leather express?

 

You fix it? Fixed mine, it was the solenoid that piggy backs the starter. What cheesed me off was O'Riely's said the starter was good. I knew it wasn't the first time. So I hooked it all up again, well just the battery to the starter this time anyway. Eliminating any other possibility right... Soon as I touched the negative cable to the battery, it would crank. So yea, what else could it be.

Boneheads I tell yuh.

 

I replaced the cyliniod that piggybacks the starter still no luck I replaced the main power wire for starter also still no luck

 

If you can jump it from the firewall, then it might be a fuse. Fuse 19 in the cab and those 50's in the power distribution box under the hood. I believe it's 20 and 21 under the hood, - MAXI 50's.

You need to check the 175amp MEGA fuses as well on the 97 model year. I believe the M-fuse on top is the ignition circuit.

If you have the little users manual that comes in the glove-box when new, that will give you fuse locations. Or, you'll have to go to Motorcraft.com and download a fresh copy.

 

Make sure you have all the grounds connected. I know there is 3 that tie to one post on the firewall. Right next to the solenoid (starter relay). Or between the 175amp block and firewall solenoid. There's just one further right, the other side of the 175amp fuse holders.

 

How difficult is it to access the bolts to the starter? Im having a similar problem as the OP and need a new starter.

D

 

I posted the answer in the other thread you asked this question in.