I just replaced the battery in a newly acquired 77 Ford F-150. upon putting the positive battery cable on the terminal it immediatly started cranking, didn't have this problem jumping it off or with the old battery... any ideas?
I traded for a 1983 Chevy S10 and it had the 350 swap done. Upon rewiring the wiring for the starter, they left "bare wires exposed"! While working on the engine (typical cleaning....fixing), the engine started to turn over and after only a few seconds, I headed toward the drivers door to turn the key off.........BUT I STOPPED! THE KEY WASN'T ON and I turned immediately back towards the motor and I noticed the wire going to the solenoid was being touched by a bare spot of a hot wire..........causing the engine to turn over. All I did was seperate the wires (NOW FIXED RIGHT) and it stopped. So check wiring also for bare and exposed wiring that may be touching!
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Okay, a clicking sound is the solenoid engaging the starter drive gear but the starting motor is not turning over. First possible is low battery. Second is bad or dirty connection, usually battery terminal. Good enough to energize solenoid but not enough amps to spin starter. Third is a bad starter motor, usually a brush corroded, worn or stuck.
Lift the hood and look at the battery terminals. if they are clean and tight, check the battery for charge. I usually hook a booster on and try cranking the engine over. ZIf it works, charge or replace the battery.
If it didn't crank, Take a jumper cable and connect the one end to the battery positive. Touch the other end to the starter motor terminal. Motor should turn over, if not, replace the starter.
Have you checked the battery terminals too to see if the cables are lose or having alot of acid on the terminals, if so please clean the terminals one at a time by using a wrench to unlose the bolts that hold the cables to the negative first and then to the positive cable but make sure that you do not put the wrench touching both the positive and negative battery terminals or your battery will explode putting acid all over you !!! Another thing is that does your starter ever make a clicking sound when you try to turn it over with key ? When you try to start the car with key that the car starter should make a clicking sound that engages it into the engine so to start it up. If this is not happening then it might be your starter not engaging into engine.
You need to check and see if when you turn the key to start that you get current at the starter soldnoid. If not check the safty switch and the ignition switch. If you get current check and see if it goes thru to the starter if not replace soldnoid if it does check the starter itself. These are all electrical and can fail at any time without any warning. Good luck.
Ford does not put the solenoid on the starter itself, so then it is just a relay, usually on a fender. It will have 4 wires. Two thick ones from the battery and to the starter. And 2 thin ones from ignition switch and to ground.
The problem is either the starter solinoid (located on fender near battery) or you are not getting power to the "s" terminal on the starter solinoid from the ignition switch. If you follow the positive battery cable from the battery you'll follow it to the solinoid. Remove the small wire from the terminal marked "s" on the solinoid and using a screwdriver jump from "s" terminal (not the wire) to where positive battery cable connects to solinoid. (with battery connected). If starter doesn't do anything the solinoid is bad. If starter cranks then you are not getting voltage from ignition switch through "s" terminal wire.
You have a bad connection. It will pass enough current to keep things running, but the starter load is causing it to burn the spots that are making contact.
I had this same issue with my '86 F-150, and the final solution was to replace the all the heavy cables: battery to solenoid, solenoid, to starter, and block to battery ground. Thoroughly clean the block where the negative cable connects, and the battery terminals.
I have found that Ford products are very sensitive to poor grounds and poor connections at the battery or starter/ starter solenoid. Clean all grounds and terminal connectors really through. Don't just look and judge them to be clean. After market add on battery clamps will corrode where you put the cable into them. Be sure to take them apart and clean there also. Also ck to be sure your battery is putting out the cranking amps it is
rated at. If not sure take it to a shop and have it tested. Good luck.