Rodney500

I am having problems with my f150 5.0 pickup. When I start my truck the starter stays engaged even after it is running. I have replaced several starters, solinoids, ignition switch, and nutural safety switches and still am having this problem do you have any suggestions?

1987 F-150 XLT 4x4

Purchase a 2.0 AWG (2 Gauge) Positive Battery Cable
along with another new Solenoid and install them both on your truck.

Do not just buy a new (stock size) 4 AWG positive battery cable that came on your truck, for unknown reasons; it is too small diameter cable now.

The Starter is probably going out, but installing the larger 2 gauge cable,
will buy you some time.

I installed 5 Solenoids, two the same day before I installed a 2 gauge positive battery cable.

Member JCMS replaced 7 solenoids before he installed a larger diameter positive battery cable.

There have been several Threads in this F-150 forum concerning the Starter staying engaged while the engine was idling.

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OtherWeckta

JCMS ended up putting 2 positive cables on attached to the solenoid, so if you can't get the 2 gauge wire right away this might help...

terettes18

i have that same truck. 88' f150 with the 5.0 302 V8 fuel injected.

i can start my truck with the old broken solenoid switch by just completely by passing it with a screw driver. i have put 3 different new ones in but when ever i do it keeps my starter engaged whether i have the truck on or off. i have replaced both the positive wire and the ground wire with the new 2 gauge wires.

what else could be the problem?

bluecar5556

If the positive and negative battery cables were replaced with 2 gauge wires, did you upgrade the engine ground from the intake manifold to the bulkhead (firewall)? After all, the starter is grounded to the engine block and the engine block is grounded to the chassis via engine ground cable and would be a pointless upgrade as far as the engine and starter is concerned.

Nitehawkjr

Most have a ground running from the starter bolt to the frame.

Just call me Sean

iTrader: (1)

Double positive:

bluecar5556

Sure, it would help but the weakest link is always the weakest link, still will be a stock 8 AWG engine ground.

Just call me Sean

iTrader: (1)

Yes, after upgrading all three of my wires I had to add the extra positive anyways.

kc0rey

If your ignition switch is not stuck in the "Start" position then you have high resistance somewhere that is causing your solenoid to weld the contacts in the "closed" position. Clean all of your connections. Every one, battery to Starter and don't forget your grounds.