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Starting Issues

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Starting Issues

Post #1 by 85FordI6Wyoming » Sun Jul 24, 2016 7:12 pm

Hey guys Ive got an 85 Ford half ton with a 300i6 and np435 4 speed. Ive been having a re-occurring issue where I go to start the truck and it cranks over but wont start. Once I turn the key off to either pump the gas pedal or choke the engine, the motor keeps cranking even though the key is out of the ignition! So I scramble around to find a wrench and pop the hood and disconnect the battery. If I reconnect the battery it starts cranking again. So then I disconnect the ignition wire on the solenoid and reconnect the battery and it starts cranking. If I replace the solenoid the truck returns to operating normally. So the solenoid is the issue correct? The problem is, Ive gone through 3 solenoids in the past 5 days! :bang: Ive been through 2 Duralast Gold solenoids and a Heavy Duty Application solenoid from Napa. Any ideas as to what is welding these things in the crank position?
1985 F-150 300 Straight 6 NP435
1979 F-250 400 T-19
1994 F350 7.3 Powerstroke ZF5

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Re: Starting Issues

Post #2 by B RON CO » Sun Jul 24, 2016 7:49 pm

Hi, my wild guess is have the starter tested. As a starter wears out it will require more amperage to spin it. My guess is the current flow is so high the solenoid can't handle it. It wouldn't hurt to check and clean all your cables and grounds to eliminate resistance at the connections. Another test I would do is with a test light at the small wire one the solenoid next to the battery cable. Take it off the solenoid ( the motor won't crank) and have a buddy turn the key from run to start a few times. The test light should go on at start and off at run. Good luck
B RON CO. Still workin' on it!

1933 Ford Pickup - 59A Flathead V8
1966 Ford Bronco - U14 - 170/200 Straight 6
1966 Ford Mustang - 289 V8

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