• Hello there guest and Welcome to The #1 Classic Mustang forum!
    To gain full access you must Register. Registration is free and it takes only a few moments to complete.
    Already a member? Login here then!

Starter Motor Wiring

Aussie67

Aussie67

Well-Known Member
Need some advice. 302W in 67 coupe.

Some of you may remember but some time back i installed a high torque starter and retained the solinoid on the fender. However I didn't change the wiring so I get some run on after the motor has started.

To fix this I understand that I need to change the battery cable whi h runs to the starter to the first (closest to battery) terminal and run a new wire from the "S" to the solinoid on the starter.

Is this correct?
 
Tony.

Yes , you run a thick wire from the battery + pole or left big pole of starter solenoid to the starter and a small wire from the starter solenoid big right pole to the coil of the HT-starter.
I would run the small wire from the right big pole of the starter solenoid to the coil of the HT-starter. Not from the " S " terminal.

View attachment 36246
 
Last edited:
Quick question, do I need to disconnect any of the existing wires on the S or I terminals/ poles?
 
So finally found some time and moved the starter cable over and made up a new wire to rum from the fender soliniod to the starter. But when I moved the battery cable to the other side the engine starts cranking. No key/ ignition turn on.

Have I missed something?

Cant really take a pic of the starter but here's one of the fender solinoid.
 

Attachments

  • 20241219_154844.jpg
    20241219_154844.jpg
    238.3 KB · Views: 4
First, be certain you have a PMGR starter, then was it originally connected as shown in the top picture, and lastly did you change it as shown in the bottom picture?
1734595440769.png

Where does this wire go?1734595606464.png
 
Just ignore me. It's all good. I hadn't removed the ignition wire from the starter. Working on my back so a bit hard to see.

Thanks again. Works fine now
 
Ok so might have spoken to soon. Tested it twice and it worked as it should. Then went to make everything permanent and the problems started again. In answer to your question above, the wire circled goes to the starter solenoid output terminal, per the diagram.

The starter is wired as per the diagram. On the starter solenoid I had a wire that went from the battery pole to a smaller terminal underneath/ adjacent. As I am on my back doing this ( I miss my 3 car shed with engine hoist, compressors, room to move) so I can't see the connection. Initially I left it and run the starter. It cranked but wouldn't stop. I then disconnected it and put the new cable on the output terminal and it seems to do the same thing.

Out of curiosity I connected the "foreign" wire to the fender new cable and it does the same thing.

The starter is a hi torque PMGR and has been in there for the last 5 years. The only issue I had with it is the run on noise. In Oz, by law we have to fit an electronic immobilizer (fancy kill switch), so now I'm wondering if this is interfering. All the wires on the immobilizers as intentional black so you can't see where they connect.​

Anyway another day tomorrow.
 
Last edited:
In case you are wondering why I am bothering to fix this after so long, I have reached the point where I am starting to struggle with a health condition, so will be looking to sell the car off in the next year or so.​
 
Last edited:
Aussie67 said:
In case you are wondering why I am bothering to fix this after so long, I have reached the point where I am starting to struggle with a health condition, so will be looking to sell the car off in the next year or so.​
Click to expand...
I'm sorry to hear of your health issues, and hope you find relief. I can't imagine why the immobilizer would connect between the solenoid and the starter. Below is the stock circuit used from at least 65-70, and the addition of a PMGR doesn't appreciably change that. The solenoid may be sticking, or it is somehow wired incorrectly:
1734683095111.png
 
So I've checked everything and to the best of my knowledge (which isn't much) everything is as it should be per the diagram.

However when I try to crank it, I now just get that screeching noise that you get when the starters not engaging. So I thought I'd just reverse everything and leave it for another day. (Famous last words) but it does the same thing.

Do you think I have screwed up the starter and if so how do I test it?

Diagram now attached.
 

Attachments

  • 20200430_131801.jpg
    20200430_131801.jpg
    250.5 KB · Views: 1
Last edited:
You must log in or register to reply here.
Back
Top