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Old 12-19-2011, 03:30 PM   #1
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1967 mustang electrical question.?

When i leave my positive terminal connected my battery dies. I have a new ignition, battery, electronic ignition, distributer, voltage regulator and starter. when putting on my headers i burnt the wire connected to the ignition and the only way to start it was ro bypass that circuit by touching the positive terminal to the starter on the regulator. I just put in a new wire harness that is in the steering culumn that connects from the horn button and signal lights. I noticed by trying to trace the electricity that the harness must have a bad ground somewhere because where the wires all connect to the connector there are some burnt wires. Yesterday my battery had a charge of around 4 volts. When i finally charged it enough to jump my car i read that in order to test the altinator to pull the positive terminal. When i did that i was reading the battery (right after the jump start) and i had a reading of around 12 volts but it was declining slowly. i didnt think at the time to see if i could drain the battery. But i did notice before i jumped it i tried to start it twice and heard a loud noise after it would turn over and immediately stop turning over. I wanted to see where the noise (bang) was coming from but by the time i got someone else to try to start it, it started immediately. While it was running i checked around the vehicle to see if any lights were on that were not supposed to be to look for the additional short but didnt see anything out of the norm. I waited about 10 minutes to get a full charge on the dying battery. Once i turned the vehicle off i wante to see if it would start again but it didnt. i didnt even hear the starter click. I dont get it. Why would the starter not turn over? Why can i only start the vehicle when jumped? Do i need to have the positive terminal disconnected for a longer period of time to see if the battery drains completly which would mean a bad altinator? What are your thouhts?
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Old 12-19-2011, 03:58 PM   #2
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1967 mustang electrical question.?

First off, pull the Negative off before ever messing with a motor.
If your repair manual did not say that, you need a new manual, a real one.
I had an Original 1967 Mustang, I bought it from the original purchaser with papers in 1978, that car still runs like a champion, original 300ci 6cyl Canadian Forged Ford Motor. 1 bbl Carb, 3 on the floor. she can out torque almost any car that comes next to her in the 1/8th, sheI own them, that is all original, I rebuilt the motor at 240,000 miles, used OEM Ford parts.
You have just about managed to ruin a very very sweet ride.
But that is your thing, so go for it, I suspect a Fuse Block, or Fusible Link , which were not made in 1967, but sounds like one of them add on electric components and all that goofy wiring that was not needed is what pooched the electrical system.
You need to have the Negative Terminal off the battery.
Positive Lead off the starter.
That is like car repair 101 stuff, if there is no ground, there can be no ignition.
If there is Ground, a circuit can be completed by any slipped wire or dropped metal object that touches Ground.
I have seen people do that , I have seen them almost lose digits when the car all of a sudden cranked.
Get a Haynes or Chiltons Manual, get both, read them. They will say Remove the battery. That knocks out any chance of it exploding in your face or starting the crank on a whoops.
Now that you have read that manual, read the Manual that came with all those junk add ons you did not need.
After you have removed about 25 lbs of junk, you might be near an original Mustang.
Wait a sec, you never mentioned the engine, ut oh, you went a bought a chop shop Mustang.
Ok, so work with what you have, you have a 67 Mustang Body with an unknown ford motor.
I wired my 67 twice, the two times it needed it, I never added anything to it, I never took anything off that was still working.
The column had three wires, Hot, Ground and Neutral.Or Positive, Negative and Neutral.
The only way to read the Voltage/Wattage and Amperage on a battery is when the battery is under load.
Go up to any 12v battery, and dry test it, yep, it has power!
they all do.
Under Load , when the motor is running, is when you test it, that way you will see if there is a bad draw, too much in, too much out, you know the stuff that is not right.
Then you can determine where to look at next, if the batt is overcharging, alternator is over amping, if battery is losing charge, is a short, a bad connection or alternator is worn out.
Those old cars are so simple, do not over-complicate a simple 12v system.
That is just not right and ruins any collectible value that car may have once had.
Sorry to be so but c?on man, is a simple 12v (unknown CI) Ford Motor.
Thats 50 years of Ford Mustang your looking at, Lee Iacoca was a genius!
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Old 12-19-2011, 04:36 PM   #3
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1967 mustang electrical question.?

You probably have a short circuit somewhere. You don't need a charged battery to test for the problem, but you do need a volt-ohm meter. You'll have to check individual circuits for shorts. Start by removing the power cable from the stater solenoid switch: is it grounding out against the body or rod that holds down the battery? If not, then proceed by removing the power cable to the starter motor from the SSS. Does it ground out against the engine or exhaust header somewhere? If not move on to the wire that connects to the ignition switch, and so on.
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Old 12-19-2011, 05:31 PM   #4
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1967 mustang electrical question.?

A 67 Mustang with a 300 inch truck motor? I've got to see that! Maybe he means 200....

anyway you may have melted some wires together, so you need a new wiring harness or get out the volt meter and start tracing wires..disconnect everything and hook them back one at a time until you find the grounded one..

You'll have to charge the battery outside the car before you can test anything
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