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Hello. I suppose it's safe to assume since you have tried a starter and a battery that the issue is no crank..
If you touch the large lugs together on the starter relay mounted on the fender, will it crank?
by touch them together, I mean with a screw driver, or pair of channel locks, etc. If it does crank, replace the relay. Please let me know once you have tried it whether it worked or not.
No problem. Take your time.
It should be on the passenger side fender. which engine does it have?
yes.. that is a picture of the relay.
OK. If he touches the two large terminals together does the starter crank?
And he replaced the starter and the starter solenoid as well as the relay?
He also replaced all the battery cables?
It usually comes with the starter motor. If he replaced the starter motor, I would imagine it was replaced right along with it. Here is a picture.
If that's fine, check to make sure all cables are in good shape and making good contact. they should be since he said he replaced them all. If that's fine, Try jump starting the truck just to make sure that it isn't a lack of battery power problem. Just having the volts doesn't mean we have the amps to crank the engine. If that checks out good, try turning the engine by hand at the crank bolt with a large ratchet or breaker bar and a socket to make sure that the engine isn't locked up.
If you jump it, the engine will crank?
Ok. Lets try something.. remove the negative cable on the battery of the truck, and connect the jumper cables to the battery of the jumper vehicle and to the cables of the truck leaving the negative cable disconnected on the truck so you are only trying to crank it with the other battery and not using the battery in the truck for assistance. will it crank then?
That's basically trying another battery
next question is, when it cranks with the jumpers attached, does it crank normal, or very slow?
that's fine. So, it sounds like the truck will only crank if it has the power of 2 batteries assisting it. ask him when it cranks if it sounds like it's cranking normal, or if it seems slow. If it seems slow, ask him to remove the accessory belts and then try cranking it.
absolutely. You can come back to this chat at any time. If I don't answer right away, it means I am busy but i will answer as soon as i am able to.
Removing the belts is a quick and easy test. If it cranks with the belts removed then it would indicate that one of the accessories is locked up and not allowing the engine to crank. I can't think of many reasons why one battery isn't enough to crank the engine, but two batteries is. I am thinking either a bad connection somewhere, or excessive resistance requiring more power.
Your welcome. Let me know what he finds when he removes the belts.
That's the belt. I believe that engine has 2 of them. . Its been a while since I worked on an old 460..