Going crazy

[Money pit]

I have a 2001 expedition, here is the problem I'm have the battery is good and charged,and my alternator is good. But sometimes I have to jump the solenoid to get it started. When I try to start the dashboard lights up but nothing happens if I jump the solenoid it'll start right off the bat. I switched out the battery, switched out the alternator, and switched out the solenoid still have the same problem. Would it be the inline fuse linkage

 

[Don Hall]

Your post symptoms may indicate a faulty starter/solenoid.
An auto-electric shop could test the starter/solenoid before
you replace parts.

 

[Motorcity muscle]

When it does this again, check voltage at battery while trying to start. Next go to the solenoid and bypass it with jumper wire from battery side to small control terminal. New solenoid or battery could be bad.

 

[Yupster Dog]

Would it be the inline fuse linkage

A Voltage Drop Test will check all the wiring.

 

[mrbadwrench]

Have you tried starting it in neutral? Jumping the neutral safety switch?

 

[JamaicaJoe]

could also be the ignition switch is worn out or a worn key. Try a spare key that is fresh.