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Classic Mustangs Talk General Discussions

General discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustangs. Discuss all non-technical topics related Vintage Mustangs here.

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Unread 12-31-2013   #1 (permalink)
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Default 1967 - ignition wont start after installing a new Scott Drake wiring harness?

Hello and happy new year, I installed a new Scott Drake underdash wiring harness on my 1967 coupe. It was easier than I thought and took about 5 hours. However, when I was done I tried to start my engine and the ignition would not work. no power...I tried used the solenoid and it started up immediatly. Does anyone have any ideas what may be wrong? Lights work....great harness but in the future also order the fuses so you have new ones when installing...
Ed

Last edited by OCSTAR67; 12-31-2013 at 11:19 PM. Reason: spelling
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Unread 01-01-2014   #2 (permalink)
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Without a crystal ball any of us would be guessing. Your guess is as good as ours at the moment. The only SD wiring harness I ever bought was an alternator harness. Before I could use it, I had to unwrap it, rearrange all the wires to their CORRECT positions, and then re-wrap it in electrical tape. Hopefully your problem is not that severe but who knows. Get the wiring diagram and trace down what is happening. That is the only way to figure it out. Mustang Wiring and Vacuum Diagrams : Average Joe Restoration

Unless I was working as PR for SD I would reserve the word 'great' for an item that at least worked as it should. Otherwise its just a jumble of expensive wires.

BTW, the fuses are sold by AutoZone, NAPA and O'Reillys. 'O' may have the best and easiest to use selection from what I saw last time I was there.
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Unread 01-01-2014   #3 (permalink)
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Recheck all wiring. be sure you have a good ground on all grounds. check voltage at ignition switch to see it is supplying voltage to the relay-- check post at solenoid with switch off and with switch on. You have a bad ground or a wire not connected correctly.

Joe
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Unread 01-01-2014   #4 (permalink)
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Hello. It could be that the connector on the ignition switch isn't pulled down all the way, or, it could be that the red wire with the blue stripe that goes to the starter solenoid isn't plugged in at the firewall behind the dash. It could be lots of things, but, that's where I would start.
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Unread 01-01-2014   #5 (permalink)
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Smile Thanks for responses!!

Thanks for the feedback. I will try a check on these suggestions tomorrow.

IVY66GT- I was referring to the ease of installing the harness and I don't think this is a product deficiency as much as installer error. The under dash harness was pre wrapped in electrical tape and all plugs exposed at the right locations to match my previous harness. Unfortunately the previous owner did some rigging on the old harness, otherwise I would have kept it. Doing a complete resto-mod and don't want to have to deal with any electrical issues in the future. Will keep you posted and always open for suggestions.

Thanks Joe and Veronica!!

Last edited by OCSTAR67; 01-01-2014 at 11:53 PM. Reason: Add thx
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Unread 01-03-2014   #6 (permalink)
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Coil (pink) wire not connected to itself or connected to tach in dash?

But then it would have not started at the Solinoid....my Fail!

I have to start mine soon after a dash rewire. My old harness was beyond crap as well so wanted to start fresh. The PO went nuts in his old connections so tried to get at every wire to check and correct if needed

Good luck with yours.

Peter
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Unread 01-05-2014   #7 (permalink)
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I think I may have found the problem. The Neutral safety switch may be bad. At junction coming out of firewall to neutral safety switch, I disconnected the junction and used a wire to bypass the neutral safety switch. The ignition worked immediately. Would the neutral safety switch cause this to happen? Does this sound right? thanks..Ed
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Unread 01-05-2014   #8 (permalink)
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Hi again. If bypassing the neutral safety switch made the problem disappear, then the problem is something related to the neutral safety switch. Before I ran out and bought a new one, though, I would first try starting the car while I was pushing on the shift lever. It could be that the shifter handle isn't going quite far enough forward.
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Unread 01-10-2014   #9 (permalink)
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Veronica, Well I replaced the neutral safety switch and it started in Park right away. I checked the reverse lights and they worked. I turned off the car and when I went to start it again, no luck, but it would start in neutral. I pushed the shift lever forward and it started in park. So I don't know if it was a combination of the neutral safety switch and the shift lever but at least with all of your help I have narrowed it down. Now I have to figure out how to adjust the shift lever... At least my wiring problems are taken care of for now!!! Thanks for all the help everyone!!!
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Unread 01-10-2014   #10 (permalink)
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Hi again. Adjusting the shifter is a very simple matter. From underneath the car you will see that there is one rod attached to the shifter arm, and that this rod is held by a nut. Just loosen the nut, tweek the position of the arm slightly, and then tighten the nut.
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