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09-25-2020, 05:47 PM | #21 |
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Re: Car Will Not Start--No Apparent Spark
I have 6 volts on the movable point arm and the stationary point arm.
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09-25-2020, 05:50 PM | #22 |
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Re: Car Will Not Start--No Apparent Spark
If that wire is shorting out, would that explain 6 volts being on both point arms? If I check the wire, I’ll have to retime the car. I have never timed a Model A, and I would like to avoid introducing yet another variable in the starting process. Could anything else explain 6 volts on both point arms? Maybe the rebuilt pop out ignition switch? Sent from my iPhone using Tapatalk |
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09-25-2020, 05:57 PM | #23 | |
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Car Will Not Start--No Apparent Spark
Quote:
I think I posted earlier that both sides of the coil have power. I checked again, and I see 6 volts on both sides of the coil. The driver side of the junction box gets 6 volts. The passenger side gets 0 volts. Putting a temporary jumper across the junction box studs reduces the voltage to near 0. I checked the jam nut, and it’s tight. I don’t see the correlation of the jam nut to not having spark. Last edited by shew01; 09-25-2020 at 06:16 PM. |
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09-25-2020, 06:20 PM | #24 |
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Re: Car Will Not Start--No Apparent Spark
If the points are closed and the ignition is on you will not get voltage on the switch side of the coil.
Last edited by wmws; 09-26-2020 at 07:24 AM. |
09-25-2020, 06:29 PM | #25 |
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Re: Car Will Not Start--No Apparent Spark
Are you getting 6 volts on both sides of the points with the points open. If so that is really weird. It could be that the end of the pigtail wire is grounding out on the upper plate and at the same time the distributer is not making ground with the block.
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09-25-2020, 06:34 PM | #26 |
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Re: Car Will Not Start--No Apparent Spark
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09-25-2020, 06:36 PM | #27 |
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Re: Car Will Not Start--No Apparent Spark
I used a point file earlier to touch up the face of the points. A moment ago, I used a new $20 bill. That will have to do. It didn't start.
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09-25-2020, 06:42 PM | #28 |
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Re: Car Will Not Start--No Apparent Spark
Yes, I get 6 volts on both sides of the points with with points open. The pigtail wire sounds plausible. I just hate to foul up the timing to check it.
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09-25-2020, 06:43 PM | #29 | |
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Re: Car Will Not Start--No Apparent Spark
Quote:
Good point. I hadn't thought about that. |
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09-25-2020, 07:39 PM | #30 |
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Re: Car Will Not Start--No Apparent Spark
A couple of weeks ago I had a road side break down! This may not apply to your situation,but have you check to see if the rotor is turning while you are cranking.Mine was not originally I thought is was my time gear but my shaft at the bottom of the distributor actually rusted away and that was the reason my distributor was not turning, and points not operating. Timing a model a is really nothing to worry about.Jack Baham who post on this site has a excellent YouTube video that shows you a easy full proof method
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09-25-2020, 09:45 PM | #31 |
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Re: Car Will Not Start--No Apparent Spark
It's time to tear into it and figure it out.
The diagram you posted will allow you to Hot Wire your ignition. In order to do that you will need to remove the distributor and the armored cable. Don't be concerned about the timing... it won't be affected at all. Loosen the jam nut and screw, and lift the distributor out. The tabs on the shafts are offset so you wont get it out of time and won't introduce another unknown. Start by bypassing the ignition switch as shown on the wiring diagram and try to start it. If it starts with it Hot Wired you've solved the problem. But be aware that with no ignition switch you will need to shut off the gas or choke it out to stop it. I find it hard to believe that your distributor isn't grounded, but having voltage on the stationary point makes no sense.... But when you pull that distributor out, look at the surfaces and be sure they are clean... also check the screw and jam nut area. |
09-25-2020, 09:46 PM | #32 |
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Re: Car Will Not Start--No Apparent Spark
I’m not sure where you are in this process but hopefully you have resolved the issue. I can only say that my similar issue was the fuse. It did not show signs of being blown but I replaced it and all was good. My visual inspection failed me in this instance. Good luck.
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09-25-2020, 10:13 PM | #33 |
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Re: Car Will Not Start--No Apparent Spark
It sounds to me like you are way overthinking the problem. I don’t know about volts here or volts there. This is a simple car, and I’m just a shade tree mechanic. But I have played with and worked on these cars for over 55 years, so I have some experience. Timing your A is a basic function and a necessary skill if you own a Model A. No need to be afraid of it. It takes maybe 10-15 minutes. It’s worth it just to know if the pigtail is shorting out (which it often does).
I suggest: Pull the distributor, disconnect your ignition cable, and turn the key on. Then scratch the end the cable on a head nut. If you have spark, you have current going into the dissy. Shut off the ign. Put the cable back in. (But not too far). Check the pigtail. No contact with the body (so no short)? Reassemble. Replace the dissy in the head. Turn the ign. on. Open and close your points. You should get a spark at the points. If not make sure you have the proper insulating washer under the point block. If you have spark at the points, reset the timing. Check for spark at the points again. If you have it, you’re good. The basic requirements to making a Model A start are fuel, spark (ignition) and timing. With those, and fundamental clearances and settings, the car should start. Your car was running OK before this problem. Mike V’s and other suggestions are valid, but do the easy things first. The answer should be simple.
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Ray Horton, Portland, OR As you go through life, keep your eye on the donut, not the hole. Last edited by 700rpm; 09-25-2020 at 10:48 PM. |
09-25-2020, 10:19 PM | #34 |
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Re: Car Will Not Start--No Apparent Spark
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09-26-2020, 06:37 AM | #35 | |
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Re: Car Will Not Start--No Apparent Spark
Quote:
I checked. The rotor turns as the engine cranks. Sent from my iPhone using Tapatalk |
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09-26-2020, 07:14 AM | #36 | |
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Re: Car Will Not Start--No Apparent Spark
Quote:
Thanks for posting. Earlier, I checked, and I had headlights and horn. Now, I don’t. So, I may have a couple of problems. Sent from my iPhone using Tapatalk |
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09-26-2020, 07:22 AM | #37 |
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Re: Car Will Not Start--No Apparent Spark
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09-26-2020, 07:44 AM | #38 |
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Re: Car Will Not Start--No Apparent Spark
The fuse is good. When removed and held to negative battery terminal, the multimeter gets 6 volts to the positive battery terminal (through the fuse).
With the ignition switch on (popped out) and the fuse removed, I get 6 volts to flywheel side of fuse holder and 0 volts to the radiator side of the fuse holder as expected. I also get 6 volts to both sides of the coil and 6 volts to both junction box studs. The movable point arm has 6 volts, and the stationary point arm gets 6 volts, which doesn’t sound right. With the ignition on and the fuse in place, I see the following changes. I don’t see any voltage on either end of the fuse (while inserted into its holder), and the passenger side junction box stud drops to 0 volts. All of the other cited measurements are the same. Sent from my iPhone using Tapatalk |
09-26-2020, 07:57 AM | #39 |
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Re: Car Will Not Start--No Apparent Spark
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09-26-2020, 07:58 AM | #40 |
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Re: Car Will Not Start--No Apparent Spark
Something is very wrong if you are getting voltage to the junction box and coil with the fuse removed. Are you sure your fuse is hooked up correctly.
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