99 7.3 won't crank more suggestions please

[jc1187]

Looking for help/suggestions.

Problem: 99 SD F250 7.3 running great before I replaced the fuel filter. Now will not start or crank over. Just a click like a dead battery. Had previous issues with clutch safety switch. Thought that was problem. Replaced switch. Still nothing. Traced clicking noise to starter relay switch under hood on passenger fender well. Jumped the switch with a screwdriver. Still nothing. When I jump the relay the clicking noise now sounds like it's coming from underneath the motor. I have not tested the batteries but feel confident they are not the problem. Both purchased recently from NAPA. Also the WTS light is functioning properly.

Any ideas you all might have will be greatly appreciated.

[ToMang07]

Sounds like dead batteries. Double-check your fuses, but I would definitely pull the batteries and have them load tested. A bad alternator will kill brand new batteries, so if you can I would test the alternator, too.

[carpman15]

also check the battery cable at the starter - check your other post in the general i replied there

a few months ago i had same problem click but no start found the battery cable terminal at the starter was rotted off - had to replace the selonoid bc of it arcing on the stud it was not able to be tightened

[Vtghost]

Battery Issue is my guess also if you live in the Rusty state i would trace back the cables like they said ^ . But curious did you test relay with a multimeter or test light?

[NCHornet]

check voltage at starter while cranking and see what it reads.

[Vtghost]

Also when your cranking engine over does your RPM Tach Move? If not it could possibly be Cam Shaft Sensor.