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Old 03-30-2019, 09:58 AM   #21
JSeery
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Default Re: No spark?

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Originally Posted by Licensed to kill View Post
There is no solenoid for the starter. It's direct power form the battery (-), through a starter switch on the floor to the starter. Battery + to frame. I am using a jumper wire from the coil direct to the battery to eliminate any possible ignition switch/wiring issues.
So what is the output from the coil? As suggested, making and breaking the (+) side the of the coil should throw a spark. Disconnect the primary wire from the distributor and hold it a half inch or so from a good ground. Disconnect the coil to distributor wire ( the + side) and with the hot wire (-) connected to the coil, touch the (+) side of the coil wire to ground and remove. You should get a spark, if not something is wrong with the coil.
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Old 03-30-2019, 10:06 AM   #22
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Default Re: No spark?

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So what is the output from the coil? As suggested, making and breaking the (+) side the of the coil should throw a spark. Disconnect the primary wire from the distributor and hold it a half inch or so from a good ground. Disconnect the coil to distributor wire ( the + side) and with the hot wire (-) connected to the coil, touch the (+) side of the coil wire to ground and remove. You should get a spark, if not something is wrong with the coil.
I'll give that a go and report back.
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Old 03-30-2019, 11:09 AM   #23
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Default Re: No spark?

I just thought of something that may be relevant. While i had everything apart for the rebuild, while doing the dizzy, after stripping it down, I had sandblasted and painted the distributor body (it's a cast iron one) and, IIRC I'm pretty sure I primed the inside of the housing to prevent corrosion. Is it possible that I am not getting an electrical contact somewhere due to the paint?. If so, where is the likely contact failure?.
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Old 03-30-2019, 11:54 AM   #24
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Default Re: No spark?

The points have to have a path to ground through there moving in the distributor and the distributor itself has to be grounded to the block. That could well be the issue if there is not a clear path to ground for the distributor. Same applies to the capacitor.
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Old 03-30-2019, 11:55 AM   #25
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Default Re: No spark?

When you rebuilt the engine did you paint the timing cover and carefully put it on to avoid scratching the new paint? You may have insulated the distributor from ground.
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Old 03-30-2019, 01:09 PM   #26
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Default Re: No spark?

So, I have ground from the points base plate to engine block so all seems good there. However, when testing the coil, we disconnected the + side (from the coil to dizzy) and put a jumper wire on the coil. With the coil feed wire disconnected from the dizzy and held close to ground and the - side connected to the - side of the battery, when we touch the jumper wire from the + side of coil to ground, IT sparks but there is no spark from the coil feed wire suggesting that there is no power to the dizzy from the coil. We tried two different feed wires and checked the resistance on the feed wires and they seem to be fine. I hope all that makes sense. Unless I'm misreading the test results, It seems to me that the coil is shot.
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Old 03-30-2019, 02:31 PM   #27
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Default Re: No spark?

There are three wires involved here, battery feed to - terminal on the coil, coil + terminal to dist (which you are shorting to ground to simulate opening and closing of the points) and the third wire is the heavy sparkplug type wire from the center of the coil you are holding near a good to check for spark.
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Old 03-30-2019, 03:47 PM   #28
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Default Re: No spark?

Yes. The heavy spark plug wire from the centre of the coil is what I am referring to as the "coil feed wire". I get no spark jumping to ground when I touch the + coil wire to ground. I get a spark at the jumper wire when it touches ground but nothing from the heavy coil feed wire. I tried two different coil feed wires to make sure that wasn't the problem.
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Old 03-30-2019, 06:08 PM   #29
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Default Re: No spark?

If it ran before it should run now!you saidyou painted everything ,on inside of dist !remove pains andget a good coil and condenser!its not rocket science,think it thru!!!
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Old 03-30-2019, 08:48 PM   #30
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Default Re: No spark?

I have installed a new condenser in a tuneup only to have a no start. And you may have paint under the condenser mounting tab. I would try the condenser that you used before the rebuild.
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Old 03-30-2019, 09:15 PM   #31
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Default Re: No spark?

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I have installed a new condenser in a tuneup only to have a no start. And you may have paint under the condenser mounting tab. I would try the condenser that you used before the rebuild.
I did. I started with the condenser that worked before the rebuild but replaced it when I found I had no spark.
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Old 03-30-2019, 09:45 PM   #32
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Default Re: No spark?

After clearing the ground path of any new paint, squirt degreaser onto the point contact pads. If, by chance any goo was on the feeler gauge it can cause a no start. Good Luck.

P. S. Some starting fluids (ether ) include cylinder lubricant.
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Last edited by A bones; 03-30-2019 at 09:56 PM. Reason: PS
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Old 03-31-2019, 12:15 AM   #33
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Default Re: No spark?

touches ground but nothing from the heavy coil feed wire
Just a thought , to get a spark from the heavy feed wire you need a condenser involved ,one wire to + side of the coil and the condenser body tag grounded ,If you have replaced the points and if not set correctly then it wont work specially if one or the other point set is closed all the time , at some point the circuit must be broken .With some point sets available now ( not USA ones ) its hard to set them ,you could try and block off one set with a piece of paper then flick the other set it should throw a spark of the heavy feed wire ,
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Old 04-05-2019, 11:07 AM   #34
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Default Re: No spark?

UPDATE. Had a buddy come over and we spent a few hours trouble shooting. Went from no spark, to intermittent, (weak, strong spark) to good spark and got it running. Can't say what we did to improve spark but got it running. However, (and this could be related), I started it yesterday to take it out of the shop and turn it around to put it on the lift and while turning around outside, it just up and quit. Wouldn't restart so I pushed it in the shop. Checked this morning and no spark. Bypassed the ignition system (jumper wire from coil to battery) and still no spark. Pulled the dizzy cap and found that the rotor had broken. Was obviously catching on the cap contacts so now i need a new rotor. Question, how do I "fit" the new rotor so it makes proper contact and does not "catch" the cap contacts? The contacts in the cap show clear evidence of the roar hating them. [IMG][/IMG]
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Old 04-05-2019, 01:19 PM   #35
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Default Re: No spark?

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Originally Posted by Licensed to kill View Post
UPDATE. Had a buddy come over and we spent a few hours trouble shooting. Went from no spark, to intermittent, (weak, strong spark) to good spark and got it running. Can't say what we did to improve spark but got it running. However, (and this could be related), I started it yesterday to take it out of the shop and turn it around to put it on the lift and while turning around outside, it just up and quit. Wouldn't restart so I pushed it in the shop. Checked this morning and no spark. Bypassed the ignition system (jumper wire from coil to battery) and still no spark. Pulled the dizzy cap and found that the rotor had broken. Was obviously catching on the cap contacts so now i need a new rotor. Question, how do I "fit" the new rotor so it makes proper contact and does not "catch" the cap contacts? The contacts in the cap show clear evidence of the roar hating them. [IMG][/IMG]
Just buzz some material off the rotor tip on a belt sander or file.......many rotor to cap hits are just caused by different brands etc.......
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Old 04-05-2019, 01:23 PM   #36
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Default Re: No spark?

That is a problem, but it would not keep the coil from producing a spark, it would just keep it from being distributed.
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Old 04-05-2019, 04:04 PM   #37
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Default Re: No spark?

Another ( but related) point was made in one of the posts. To make spark and test the coil with a lead wire you must use a condensor in the circuit like the picture from above. Everyone should have a condensor wired with two clips and a wire ......
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