I need to know where the wires go on the terminal of the solenoid on a 1990 f150

DO NOT omit the 10 gauge ground wire

Hey i recently bought a 1990 ford 5.0L 5 speed. Clutch safety switch was not working proper, bypassed the safety switch, truck was running rough but when you take the wire off of the small top post of the solenoid and apply it to the positive terminal of the solinoid it runs well. After tracing the wire i found that by applying that wire to the positive termina i get power to what i believe is the "run" wire in the TFI plug which is plugged into the distributor. it is the third wire from the right side of the plug when your looking at it with it unplugged facing yourself. Still trying to track down where this wire runs to but if i find out ill let you know sounds like we may have the same problem

Hi, if you have the solenoid on the fender, connect the big wire from the battery on one side and the big wire to the starter on the other side. It doesn't really matter which side, but if there are additional wires that fit on a big terminal, they go along with the battery wire. The smaller terminal marked "S" gets the wire from the ignition switch (via the safety interlock switch). If there is another small terminal on the solenoid, it either goes to the ignition coil or is not used. Please let me know if you have any questions and thanks for using FixYa.

the live goes to the colonoid and the earth to the mount but the threads should be differnt sizes where you tighten the wires to it

we have 1998 ford f15 we replaced the ignition and it still wont start the truck,, the key turns over now and the radio and everything comes on but it wont start, what is wrong???

Check back the wiring connection at the solenoid. Solenoid acts as a switch between the 2 terminals. When a solenoid engages, it makes a bridge between the other 2 terminals. There are 2 possible reasons: 1-Wrong connections cause bypassing the solenoid function controlling the connection from other terminals so current could continue flowing to the starter causing it keep turning. 2- Bad solenoid with a broken spring inside causing the bridge between the 2 terminals conducting a current all the time for starter to keep turning. If checking the connection correct then replace the solenoid.

Solenoid was not mentioned as replaced.

If it was not part of new starter...that's the culprit.

Ignition switch (smaller wire) activates the solenoid (heavier wire) which in turn activates the (high current) starter.

small wire with boot goes on the s stud for starter. need to buy relay from a better part store like napa

hi from the uk if you look at startermotor solenoid you will see two large threaded terminals with nuts? and a third small terminal either spade or round terminal ok? now you should see thet one of large terminals already has a metal or braides strap secured to it and the actual startermotor body? LEAVE THIS ALONE the other large terminal is the one you fit the positive+ lead to from battery also there should be another lead to also attach to same terminal this one supplies power for vehicles electrics etc ensure you secure these with nut ok? now the third small spade or post terminal you will hav a thin wire nearby ?this attaches to thisterminal on its own on solenoid this wire is the one that activates starter when ignition is turned to key start position ok? as for interior light not working ? try again when you complete the above also make sure bulb is ok? ps! before you reconnect starter wires ensure the earth/ground lead is disconnected from battery and when reconnecting battery connect positive lead first then the earth lead or if you try other way you will have sparking from pos lead as you try connecting to battery hope this info is clear instructios for you to follow and wish you luck best wishes from england

Cupwalker
There should be 2 wires going to the starter/solenoid. One should be a big heavy duty type battery type
wire and the other should be a smaller wire. The large wire goes to the larger of the two lugs. This lug will have a large nut maybe 7/16 size. The smaller wire goes on the smaller lug.
Be sure the ground terminal of the battery is disconnected before you do any connecting
wires.

Hope this helps Good luck Loringh PS Please give me a rating if appropriate Thks