Question about 1985 Ford Mustang

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Old style starter relay wiring

This is in a dirt track car , where we are using a key switch to simply power everything. The rest is a toggle/push button set up. My question is this...on an old style solenoid/relay, which is what we are currently running, what is the friggin "I" post used for? I know that my push button goes to the "S", and I have my coil powered of off its own toggle, but what is the purpose of the "I" post on the relay?, is this for and older application?, maybe a points ignition?

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Normally on the old style starter solenoid/relay you have two large bolts for the battery and starter cables to attach to. There are two other smaller bolts that are used for the starter actuation. The "I" is used to add voltage to the points so the engine will start while the solenoid is in the start position, the other "S" goes to the start button or start side of the ignition switch. Old style ignitions used to drop the voltage to the coil during start and the engine would turn and turn until the key was released and then the engine would catch and start. To cure this they made the solenoids were designed to give temp power to the ignition system when cranking and starting. Hope this helps, RAC

Posted on Apr 13, 2009

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The I is ignition usually this runs from the ignition switch to the solonoid which in turn activates the solonoid and kicks it in to power up the starter.

Posted on Apr 13, 2009

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We need the schematics, to also put toggle switch for starting


Fitting a toggle switch for starting used to be a budget method of overcoming starter switch and other problems on older cars but will not work where the standard ignition key contains a transponder.

You haven't provided enough detail for a good answer but wiring a (spring return type) toggle switch to operate the starter motor is relatively easy and requires only a battery live and a wire to the starter solenoid or to the coil of the starter relay if you wish to use a relay.
Mostly these wires can be extended from the existing harness to the new switch.

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Well Sandra , the thing to do would be to get it to turn the engine over with the key , Then diagnose the no start problem . Look at a wiring diagram (do you know what that is ?) When you turn the key to start , the electrical part of the ignition switch sends B+ voltage to the starter interrupter relay through the clutch switch to the starter motor solenoid . Testing the electrical circuit with a DVOM - digital volt ohm meter with the help of a wiring diagram ,so you know where to test is the proper way to diagnose the problem . Not guessing ,an rigging the stuff . You can find free wiring diagrams here http://www.bbbind.com/free_tsb.html
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I have a 1982 dodge ram w150 318 4 speed when i turn the key i lose everything let me start from the beginning my truck started up then died then when I went to restart I heard a thunk then nothing last...


What happens when you turn the key to on? Do the warning lights and gauges come on? Turning the key to start, do the lights and gauges stay on? Just nothing at the starter?

Or does power just shut off when you turn the key to start, everything goes out, no warning lights or gauges? Then check cables, battery terminals, grounds for clean tight connections. There is a problem between the battery and the ignition switch.

If the switch still receives and sends power out (to the dash, for one) but start circuit is not working (from battery to ignition switch to clutch switch to starter relay to starter solenoid to starter to ground-and back to battery), then here's where we at: with key off, use a small screwdriver and short the big cable at starter to the starter solenoid small wire connection, or use a small jumper wire to do the same-battery cable at starter to the small wire connection on the starter solenoid. Starter motor should spin and crank engine. Does it? If so, start checking the start wire out of ignition switch for power when key is held in start. If you have a clutch switch, check for power in with key in start. Should have battery voltage to the clutch switch with key held in start. Keep checking the start wire along the start circuit. Not sure how the start relay is wired into the circuit, would have to see a diagram, but if you pull the relay out and use a test light or multi meter, could check for power on the terminals where relay plugs in. Key off, should have one terminal that is hot. With key held in start, at least one other terminal should also be hot. This would be the start wire out of ignition switch sending a signal to the relay.
Good luck, hope you find it. Sorry I don't have a wiring diagram to help you more.

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I have 93 dodge power ram and it wont start it has power to the starter but not any where else even with the key in the on position


ignition or starter relay should be checked first.
Faulty ignition switch might be an issue.
You will still need an ignition source before you think about the push button start.
A friend has the same problem, and its a computer issue. (underhood, pass side low on firewall)
best of luck to ya.

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1 Answer

Won't start


So it's a no crank condition? Do dash lights, gauges, and everything else work when the car won't crank over? If so, buy a cheap $5.00 testlight, and when the car won't crank, pull the small black wire off the starter solenoid. While someone holds the key in start (cranking) position and clutch pedal depressed, see if the black wire has power as it should. (Ground the testlight and just touch the wire's end terminal. If powered, the testlight will light up.) If power there, then the starter solenoid is failing. Toyota starters are very good units, but the solenoid's internal contacts get old and pitted.
If no power at the black wire, then the start circuit from ignition switch to clutch safety switch (on the clutch pedal) to starter relay to starter solenoid will have to be diagnosed. To double-check: take a single battery jumper cable and put it on the positive battery post connection. Put the other end of the jumper cable on the solenoid terminal where black wire was removed. Key can be off. Make sure car is in neutral, brake set. If starter now operates, solenoid is O.K., and it is a problem in the start circuit, -ignition switch, neutral start switch, or in the wiring.
Now find a grounding place for testlight under the dash. When car won't crank, check for power coming out of ignition switch on the black wire with white stripe. This is the start wire for the starter solenoid. Key must be in crank position. Wire shoud be powered-ignition switch is working. If no power, switch is failing. You can do the same for the clutch start switch-it's a simple switch, that when clutch is depressed switch is closed and passes power on from ignition switch to the starter relay (thus allowing power to the starter solenoid). Black wire, red stripe-this is wire from clutch switch to starter relay. When key is in crank, clutch depressed, this wire should be hot.
With me so far? Still haven't found a problem, or any loose connections? Next and last is the starter relay. It is located under dash, close to gas pedal, but under the center console, just forward and left of gear shifter. It can be tested and the wiring diagnosed there, but relays are cheap, so just swap in another and see if that helps.
If you have tried everything, and still no help, you could try a new wire from the relay to the starter solenoid. This is that black wire we started with. Older toyotas sometimes have a problem with degraded wiring not passing enough current to operate the starter

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1 Answer

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If the new starter is no better than the old starter, I would still consider removing and having the starter tested on a bench to see if it is functioning correctly. Check the connections from the battery to the starter to make sure the cable in between is not causing this problem.

The fact that push starting the car will start it, tells me the ignition and fuel systems are ok. It's a possible bad starter again if the wiring is alright.

Good luck on this repair.

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