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my 79 ford f 150 pickup won't start, i replaced my alternator, starter, had my battery tested it tested ok, when i try start it clicks at the solenoid.
Does the solenoid click once or numerous times when you hold the key to start?
If it just clicks once and the starter doesnt turn it could be a dead starter solenoid. Check for 12v at the large terminal towards the front of the engine. It should be present there even with the key off. Then turn the key to start and see if the 12v is on the other large terminal , towards the rear. If there is no volts then the solenoid is dead, or you have open or corroded power wires. If you get 12v there then check for 12v at the power terminal of the starter. If there is none there then the power wire is open.
You could also use a jumper cable and bypass the solenoid by putting 12 volts direct to the large terminal to the rear of the solenoid. This should cause your starter to turn if its wiring is good and it has a good ground.
If the solenoid clicks numerous times with the key to run you arent getting 12 volts to the solenoid to close it. Which usually suggests a dead battery, but since yours checked good it must be a problem in the wiring from the ignition switch to close the solenoid. Try jumping 12v from the battery direct to the solenoid to see if it closes and the starter turns. If so you have to repair or replace the wire from ignition switch.
Good luck. Let us know what you find out.
By all means,please wire brush the bateery posts as well as the cable terminals.If you have the quick repair terminals,replace with new ones or replace with a complete cable.On the quick repair terminal,the trouble is where the cable is clamped to the terminal.If this doesn't do any good,have your battery load tested by someone/something else.
Phillip
Check to make sure that the ground strap from the engine block to the body is still connected. If you can't find it run a jumper wire (12 gauge or larger) from the negative battery post to one of the mounting screws on the solenoid. Hope this helps.
Mike