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Old 09-01-2009, 06:45 PM
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66 mustang problems

Hey guys im having some serious issues and looking for some advice on what to do. The problem is this my mother in laws 1966 mustang wont start. Me and my father in law have gone through and replaced, starter relay, battire, voltage regulator, and a new ignition switch. The battire keeps dying over night. We charge it up and nothing. tonight we put the ignition switch in but cant get it to start again what else could be doing this. The only way we can get it to start in by jumping out the starter relay, we have replaced the relay twice already so we dont think its the relay. Thanks

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Old 09-01-2009, 08:29 PM
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neutral safety switch ( automatic trans ) or clutch cut out ( manual trans ).. as for a draw. got to pull fuses and check with a test light till you find the 1
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Old 09-02-2009, 12:26 PM
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its an automatic and i disconected the plugs up on the dash and checked for power. Power is there when i turn the key one but not there when i turn it off. would it have power when the harness is fully conected and draw power from there then?
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Old 09-02-2009, 12:43 PM
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Cranks but won't fire, or won't even crank??
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Old 09-02-2009, 12:49 PM
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wont even crank. You can jump out the starter selionid and get it to fire that way but thats only in an emergency not something we want to do all the time lol
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Old 09-02-2009, 12:55 PM
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Have you tried to start in in a gear other then park? If not try it and see what it does in the other gears just make sure nobody is standing in the way in case you nail it or something. Also push up on the shifter while you are trying to start it like you are holding it in park..JMO. Cole
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Old 09-02-2009, 12:59 PM
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ill try that anything that might work im willing to try lol
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Old 09-02-2009, 01:02 PM
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I had a 65 that done the same thing, But i could push foward on the shifter and it would start everytime. I rebuilt the shifter and it worked fine after that. Cole
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Old 09-02-2009, 01:15 PM
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Yep, neutral safety switch on the shifter or on the side of the trans where the shifter linkage hooks up. Cranking hot goes thru this switch, from the ignition switch to the starter relay.

Last edited by ericnova72; 09-02-2009 at 01:24 PM.
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Old 09-02-2009, 01:28 PM
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isn't there a bypass plug for the NSS under the dash being some Mustangs got column shift auto's, and the wiring harness is the same for the Falcons?.. my guess is if it's there, it could have come out breaking the circuit
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Old 09-02-2009, 01:54 PM
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this is probally bad but i jumped out the switch ends that goes to the ignition and it started i think the nss is bad and will be replacing it. I think the voltage regulator might be the problem with the battire being drained it was hot and when i put the old one back on it never got hot and seemed to work fine
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Old 09-03-2009, 03:11 AM
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I have a 66 mustang that is a hodge podge of parts. From what I can tell it has a 1974 C4 trans and an early 80's V8. It is an automatic. The starter grinds on starting and for a few seconds after starting. I have replaced the flex plate which was slightly bent with the same result. I have tried 3 different starters all with the same result. I have also replaced the spacer betweeen the bell housing and engine. Could it be the solenoid or ignition switch? The ignition swith is new. Any help is appreciated.
Lifted trucks
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Old 09-04-2009, 02:02 PM
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66 mustang problems

Jaques

Since you mentioned a mix of parts the first thing I would check it that you have the correct starter and flexplate for the combination you have. They have 157 and 164 tooth flexplates with either 26 or 50 ounce counter weights. They have specific starters to match certain applications.
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Old 09-05-2009, 06:20 PM
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hey guys i got the new nss and i went and started installing. The problem i have now is this, The center bolt or whatever it is came out and i put it back in but i dont think it is in right. It is lose and i dont know how to tighten it. It didn't look like a bolt at all to be honest any body got any ideas that would be great
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