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Won't start now
(01-02-2019, 08:27 PM)midlife Wrote: There's a problem in the wiring from your ignition switch to the coil.  How do I know that?  When you jumper the battery to the S terminal, the starter solenoid also puts out full battery voltage to the coil, bypassing much of the ignition to coil wiring, not not all.  The infamous pink resistor wire, located in the underdash harness, lowers the voltage from the ignition switch to the coil from full battery voltage to 9V or so.  If the voltage is much below that for whatever reason, the engine will not run well.  Since it runs good with full battery voltage, that seems to isolate the problem primarily in the underdash harness or the connector to the headlight harness, or from that connector to the engine gauge feed plug near the firewall.  That's where the junction is from the I terminal on the starter solenoid to the main coil line is joined (bypassed).

This is good stuff a lot for me to trace down Motor does run great never been raced all stock ,,im going to start with a new key swtch since its hard to turn and stays stuck in the start position hard to return to off...ill start their
then ill follow all this info step by step thanks so much every body ...im here to stay...

(01-02-2019, 10:21 AM)delawarebill Wrote: lets make sure wires are correct. now looking at the sol pic.. left is "plus" battery, #2 wire (SMALL) is from ign sw start, #3 (small)is 12v to dizzy, right large goes to starter. first test as mentioned by a jumper from battery + to the right large wire to see if starter turns motor over (yes/no?). if yes then next is the left small wire should be 12v with key in start mode. do that and post results

Starter does turn when jumping two big terminals on the solenoid

Ok ,,,I got another problem key switch is messed up key come out and still can turn it NAPA says I need to know if the switch was made before 5/14/1973 or after any info on this ,,,I hate to ask you guys have been pouring in info (when in done I hope to know this car inside out
[Image: 20190103-121235.jpg]

You'll need to get you car's build date off the door sticker.

The tumbler pins are probably gummed up in the lock. Did you try any penetrating oil, to see if they would free up?

That is just the lock, the electrical switch portion is on top of the steering column, under the dash.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
You can also pull the lock out and take it to a locksmith, see if they can repair it. If you want your new lock key to match the door locks, the tumbler pins in the new lock will have to be changed to match your old key. Or, you can get a complete lock set and change your door locks, too.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
OH a big OH ill have to back up on this job I took the wheel off and started to take the lock out but couldn't so ill put everything back(not a problem) and change the switch Thanks for that Don the lock and keys thing doesn't matter to me ,,I just have to figure out how to remove the switch,,

It's easier if you drop the column down at the dash. Then there's two nuts and a connector on the switch.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
Don't forget to disconnect the battery before tackling removing the ignition switch!

Let me check your shorts!

[Image: Flamicon2.jpg]

[Image: oldfart.png]
[+] 1 user Likes midlife's post
I found a new problem just like Midlife said connector under the dash looks like burt wires ,,,the yellow and red wires are from an alarm system the pass owner put in I did remove it ill remove the wires too soon ,,could this connector be to the starter switch? im going to get in to fixing this too I hope this will fix the problem (ill put changing the switch on hold for now
[Image: 20190103-235414.jpg]

That's the connector for the ignition switch. The wires to the left with the black sheath go to the switch on the column.

73 WIRING DIAGRAM - https://www.7173mustangs.com/images/1973_full.pdf

See page 4.

I also see a butt connector on the Red w/Lt Blue stripe wire, which is the trigger wire for the starter solenoid. That probably was hooked into the alarm system and is part of why you're having difficulties.

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