Where would you start.......
Thread Starter
Instructor
Joined: Aug 2000
Posts: 124
Likes: 0
From: Baltimore, MD.
Where would you start.......
to look for an electrical problem. I have a 74 with all the power options. When I close both windows at the same time and just about the time they are closed the car shuts down, just like someone thew a switch to turn it off. Everything else, gauges, radio , lights etc., all work like they are supposed to with no problem. :confused:
In advance thanks for any help. :cheers:
In advance thanks for any help. :cheers:
Instructor
Joined: Jul 2001
Posts: 168
Likes: 4
From: central Washington state
Re: Where would you start....... (Vettef250)
f250
I would start to look at the power window switches. Start with the easy stuff. I'd also buy or otherwise obtain a wiring diagram specific to your car and options.
I would start to look at the power window switches. Start with the easy stuff. I'd also buy or otherwise obtain a wiring diagram specific to your car and options.
Melting Slicks
Joined: May 1999
Posts: 2,897
Likes: 0
From: Moon Township PA
Re: Where would you start....... (Vettef250)
I would check the condition of the battery and its voltage, the output of the alternator, and then I would start looking at the window motors themselves. I would think that the window electrical system is overheating and shuts down. When it shuts down, will it come alive again after a while? If you will remove the door panels and the plastic liner, you can then do some troubleshooting with an assistant. Do your window thing and then feel the motors. Does either one get overly warm? Try operating the motors while testing the voltage at each motor. I would that you either have a window motor going South or some inherent resistance in the wiring to one of the motors. Try cleaning all the contacts from the switches to the motors themselves.
Just my $.02.
Gary
Just my $.02.
Gary
Le Mans Master
Joined: Jan 2001
Posts: 9,250
Likes: 221
From: Dryden MI
Re: Where would you start....... (GaryS)
Is there any chance that you are using your window circuit to power your ignition system or some other accessory? The window circuit is controlled by a circuit breaker.(not sure about the 74) You might be opening the circuit by operating both windows at the same time and the additional load of the ignition system will open the circuit, and stop the engine. Just a thought. Roger L. Gibbons
Racer
Joined: Aug 1999
Posts: 414
Likes: 3
From: Mineral Ridge Ohio
Re: Where would you start....... (Vettef250)
Did this problem start just lately, or can you say that it started when you changed to the Pertronix/MSD ignition parts? As suggested above, did you tap into the wiring to power these things in the window circuit? Something there may be very sensitive to voltage levels. A good place to look for wiring problems, is the ground connections. If there is a dirty or loose ground, the resistance goes way up and causes a large voltage drop along with an increase in current. Start with the battery ground at the frame and go from there. I hope this helps to get you going in the right direction.
Thread Starter
Instructor
Joined: Aug 2000
Posts: 124
Likes: 0
From: Baltimore, MD.
Re: Where would you start....... (blu73)
blu73,
Not 100% sure but it seems that ever since I put the Pertronix sys in I have been having trouble. When you turn the key on the voltage drops in half, then when the motor gets enough gas it will finaly start. I need to find out if it gets wired b4 or after some sort of ballast. I just got a diagram for the Pertronix sys so I am going to get everything checked out.
P.S what made you ask if it had any thing to do with the Pertronix Sys....personal trouble??
Thanks,
Steve
Not 100% sure but it seems that ever since I put the Pertronix sys in I have been having trouble. When you turn the key on the voltage drops in half, then when the motor gets enough gas it will finaly start. I need to find out if it gets wired b4 or after some sort of ballast. I just got a diagram for the Pertronix sys so I am going to get everything checked out.
P.S what made you ask if it had any thing to do with the Pertronix Sys....personal trouble??
Thanks,
Steve
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Racer
Joined: Aug 1999
Posts: 414
Likes: 3
From: Mineral Ridge Ohio
Re: Where would you start....... (Vettef250)
I have the Pertronix that uses the magnet ring for triggering. I stayed with the Pertronix coil and wires. Never a problem. I simply noticed your combination of parts in your sig. Being unframiliar with MSD stuff, I just asked if something in that system needs at least 12V to work. I looked at your last post, and you say that the car starts hard with the Pertornix. Is yours the lobe sensor type? If so, I have seen comments here saying that type of Ignitor needs a few seconds with the key on to charge up before it works. Is it possible a big voltage drop pulls enough power away from the Ignitor to cause it to quit? Just guessing.