STARTER SOLINOID 90 F 150

Jeffs solution (above) is for a different problem. If the Starter Motor continues to turn with the Ign. Sw. off, yours won't be a Starter Motor problem. However, the most likely cause is either the wire to the Starter Solinoid or the Solinoid itself.

I can't see the alternator being the cause either, as suggested above.
.
Try this
Disconnect the thin wire from the Solinoid (this is the one that activates the Starter when you turn the key).
With the battery charged, the Starter shouldn't work. Put the wire back and try again. If the same problem is there, quickly remove the wire.
One of 2 things will happen:-
1: The Starter will stop. The cause is in the wire to the Ign. Sw. or the Ign. Sw.
2: The Starter will continue turning. Repair or replace the Solinoid.

WWhen looking at the starter you will notice the solinoid mouted on top of it, the solinoid has one ten mm stud sticking out the rear of it with a short cable running down to another short stud sticking out of the rear of the starter motor. Connect the main battery lead to the stud on the solinoid before you reconnect the battery

First you unhook the battery neg side first then pos side then you remove the wires from the starter solinoid make a mental note so you know how to hook it back up then take out the two starter bolts holding it remove old starter put new one in put the two starter bolts in then put wires back on the solinoid hook the battery back up and your done.

STARTER GROUND TO THE ENGINE BLOCK.RED WIRE IS BATTERY POSITIVE CABLE TO STARTER SOLENOID.

check the wiring to the starter sounds like your starting wiring is not making good contact if not test with a test light and check the fuse hope this helps

hi, i think you have put the MAIN HEAVY CABLE direct to the STARTER MOTOR on the SOLINOID. this will keep the starter motor running. take battery lead NEGATIVE CABLE OFF the BATTERY, and change the MAIN HEAVY CABLE from the SOLINOID terminal to the other MAIN terminal on the SOLINOID and NORMALLY it SHOULD go with a SLIGHTY (smaller cable this GO'S to the FUSEBOX rest of car POSITIVE FEED). the other small wire is the solinoid START WIRE. the solinoid has 2 circuits the first circuit is HEAVY BATTERY LEAD to 1 terminal on the solinoid. the other side of the solinoid HEAVY CABLE to STARTER MOTOR. this is only 1 side of the SOLINOID (THIS IS A VERY VERY HEAVY SWITCH). the other side of the SOLINOID is the START SIDE (REMOTE CONTACT) of the SOLINOID, by turning the IGNITION KEY to STARTER POSITION, this operates the SOLINOID. this makes contact to run the starter motor. once the connections are done REPLACE NAGATIVE BATTERY LEAD and start the car. gerry

There is only one wire common to the alternator and starter and this is the main+ wire which goes from the alternator down to the main feed terminal of the starter solenoid from there it runs to the battery + terminal.If you are replacing the cable use one of the same diameter......

try to cross jump the solinoid, or remove starter and hook jumper cable to wher hot wire goes then ground houseing with neg cable it should kick in and wrr if it does its good replace the solinoid. if you can cross jump solinoid it is also bad solinoid. berrydalewolf.

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.

are we talking starter motor solenoid here? if so both are positive the one from the starter motor goes to the lower the one from the battery goes to the top but it does'nt really matter as there job is only to energise he solenoid