Question about 1979 Ford F 350

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Starting Issues 1979 F150 1/2 ton 4wd with 351M and c6 auto trans. brand new starter, battery, and solenoid. most of the time ill have power to the switch. sometimes i dont. but when i do if i turn the key back to the acc my radio and everything is fine but when i turn it to the run position with out even tryin to start it the solenoid makes a weird noise and i loss all power until i go mess with the wires a lil bit and then i got power again to the acc position. on the solenoid, mines got two wire for the front stubs. i wasnt paying attention when i took them off the stock solenoid and i dont remember which way they go on. ive tried them both ways and still no luck. if i take a set of jumper cables and hook them up to the solenoid the motor turns over but no fire. not sure if i got spark but thats not the problem right this moment its the fact that the truck wont turn over at the key. if any one has run into this problem before and knows a solution or even an idea of wat to try please email me at lilred90997@yahoo.com because i dont get on this site very often. also looking for the wire harness diagram so its easier to trace my wires back to the ignition switch easier. Thanks alot! Brandon

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Brandon,
I would replace the ignition switch itself.
You can go to Alldata.com on line and get all the information on your vehicle to get the wiring correct.

Good luck

Posted on Jul 18, 2009

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Ignition needs replacing s its worn out the contact points inside the unit!
they are not worth the time or trouble to resolder!

Posted on Jul 18, 2009

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1 Answer

How to replace starter solenoid , Suzuki 2010 sx4


a/t or m/t transaxle >???? ill guess auto.
fuses tested,good , battery ok, jumper cable jumps fail.?
1,2,3,,,,,
battery lugs clean ?????

immobiliser light off. key on.?
next test is hot wiring the starter solenoid
keys in pocket (it wont start) but will crank fast, in park.
if yes, you have a good starter. all in 5min work.
we use $5 push button cable to do that, most guys a screw driver jump.
so if that test passes the KEY line is bad. a whole other matter
http://www.fixkick.com/starter-hotwire.jpg

big lug to tiny. grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr , this work?

if the KEY line is bad.?
then try to crank in neutral as the opr. guide explains
if that works the PRNDL switch is bad.
easy test with voltmeter, ask.....

now ill answser the how to question./
remove starter, replace starter.
or same on the bench remove solenoid , buy one and put it back.
finding solenoid can be hard.... (time to get it , and down time)

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1977 Ford F-150 Custom (engine 351M, automatic, no a/c). No key in ignition. When connecting neg terminal to battery the starter engages. Also all lights (head lamps, interior and dash lights) will not...


Replace the solenoid and/or starter as there is a short internally that is allowing the solenoid to engage the pinion and engage the power to the starter armature.. Everything you have mentioned points to a starter problem

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1 Answer

New battery new starter nothing happens when i turn the key


You definitely have a starting system problem. You have two circuits - Battery to starter circuit & the Starter Control Circuit (Ignition switch, Transaxel Range Switch (if Automatic Trans), Starter Relay, Starter Clutch Pedal Position Switch (if manual Trans) Fuse & Starter Solenoid). Based on your description, the problem is in the Control Circuit.

Here's an illustration:


ghost45_54.jpg

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Engine light comes on, auto pro ran diagnostic states solenoid, not sure if starter or transmission solenoid, however sometimes sounds hard to turn over, perhaps starter solenoid is the engine light...


dont believe a starter solenoid would throw the check engine light so you prob have further problems not in coincidence with the not starting issue.

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clicking noise when you turn the key? Sounds like the solenoid for the starting system. I know they are mounted on the wheel well on earlier fords but not sure exactly where. Follow the 1/2 in starter wire from starter up. Should go to solenoid. There should be three wires to the solenoid. Battery, starter, and switch power. Maybe there's another not sure. But I'm sure that's your problem, not sure on cost of new solenoid.

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Your starter solenoid is likely the cause of your intermittent starting problem.

The solenoid sometimes will develop an issue where it does not engage to allow current draw from the battery by the starter, which causes intermittent starting issues.

If you hear a "click", during the times that the engine will not turn over, this is the most likely culprit. Replacement of the starter will solve the issue.

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