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Old 08-12-2007, 02:21 PM
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Trying to get a heartbeat

I am working on my 1967 C-10 283, I finally got power to the fuse box so I could turn it over with the key and there is power going to the coil but no spark.

The last guy that had the pickup tryed timing it, and I didn't know if the timing was way off if it would make it not spark.

My guess is the coil is bad. I have a 1969 C-10 parts truck with a 350 and my last question is if the coil would be the same?

Any other ideas to why there is no spark??

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Old 08-12-2007, 02:32 PM
F&J F&J is offline
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First thing I would do is put a test light on the power lead on the coil, to see if you lose power when cranking. If you do, then trace the wire from the inboard small terminal on the starter solenoid, back up to the coil.

If you do have power when cranking, I would suspect poor contact at the points. To test: Rotate motor till points open; then pull the coil wire out of the cap and hold it 1/8" away from a ground. Then use a screwdriver in between the point contacts which should cause a nice white/blue spark to jump from the coil wire. If it does, the points are dirty.etc.

Edit; yes the other coil will work; same coil.
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Old 08-12-2007, 02:59 PM
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what i forgot to mention was that I got power to the two wires coming to the coil but we took the plug out the top of the coil and stuck a test light in the hole then tryed turning it over but it didn't light up.
Which means there is no power from the coil to the distributor.
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Old 08-12-2007, 03:13 PM
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Quote:
Originally Posted by oldsmobilekindofguy
what i forgot to mention was that I got power to the two wires coming to the coil but we took the plug out the top of the coil and stuck a test light in the hole then tryed turning it over but it didn't light up.
Which means there is no power from the coil to the distributor.
Need a lot more info. What type of distributor, points, HEI etc.

You can not use a conventional test light in the high voltage tower of teh coil.
If you have a test light, put it on the negative side of the coil and crank the starter. The light should flash. If it does your points or trigger devce is working. You can check for secondary voltage by removing the coil wire on teh distributor end, hold it 1/2 inch from a good ground crank the engine and see if it sparks. If no spark the coil is not working.


Run these basic tests first and post the results
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Old 08-12-2007, 03:19 PM
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You can not use a conventional test light in the high voltage tower of teh coil.
If you have a test light, put it on the negative side of the coil and crank the starter. The light should flash. If it does your points or trigger devce is working. You can check for secondary voltage by removing the coil wire on teh distributor end, hold it 1/2 inch from a good ground crank the engine and see if it sparks. If no spark the coil is not working.



I agree with this. If it is points and has been sitting awhile you will probably find voltage on both sides of the coil while cranking(no switching signal).
If that is the case I would file the white stuff off the points and try again.
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Old 08-12-2007, 03:19 PM
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Yes, the test light on the negative should blink. If it does not, then suspect the points.

Another way to test the coil is to disconnect the neg wire from coil, then use a jumper wire (that's grounded) to touch the neg terminal on the coil..on & off...will make the spark jump from the coil wire if you hold it near a ground.
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Old 08-12-2007, 03:32 PM
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thanks alot i will try that
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Old 08-12-2007, 06:38 PM
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I tried your ideas and they didn't work

if the timing is way off would that prevent the coil from making spark
I wouldn't think so because the timing has to do with the distributor and that is in line after the coil
but I don't know??
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Old 08-12-2007, 07:53 PM
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Hi,
It sounds like you need a coil, a new set of points & condenser, &
maybe a new coil wire, with what this stuff costs, why fool around with
the old stuff, it will just aggravate ya.
Good luck.
Rich
PS If you think the timing is way off, why not time it? If you don't know how just ask, But the coil will fire regardless of where the timing is set.

Last edited by richard stewart 3rd; 08-12-2007 at 08:01 PM.
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Old 08-13-2007, 06:41 AM
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Quote:
Originally Posted by oldsmobilekindofguy
I tried your ideas and they didn't work

if the timing is way off would that prevent the coil from making spark
I wouldn't think so because the timing has to do with the distributor and that is in line after the coil
but I don't know??
No timing wont prevent spark. Was the test light pulsing or just on steady. If it stayed on steady either your points are no good or you have a broken wire between the coil and the distributor. If the light doesnt light at all then you may have a bad coil. If the negative side doesnt light check the positive side of the coil for voltage. If it does either the coil is dead or the points are stuck closed.
To make this easier put your test light on the + side of the coil and let us know if it lights both with just the key on and during cranking. Post the results
Then do the same on the negative side while cranking and post the results.

You can check the coil with an Multi meter if you have one. Across the two small terminals you should have less than 1 ohm on most coils.

Is this a points setup
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Old 08-13-2007, 01:29 PM
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yes it is a points setup
Ican't know if the points are bad or not till i get a coil that will make spark
it did stay lit when we put the test light on the negative side but if the coil isn't making spark then there is nothing oing to the points right?
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Old 08-13-2007, 01:38 PM
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Let's try this one more time

Take off the neg wire from the coil.

Then make sure you have power to the plus side of the coil.

Take the coil wire out of the dist cap, and hold the end terminal 1/8" away from a ground on the engine.

Now take a jumper wire; hook one end to a good ground, then touch the neg terminal on the coil, on & off a few times and that should make the coil wire spark each time.

If it does not spark after doing everything listed above...you need a coil or coil wire. To bypass the coil wire, use bent up steel or copper house wire and bend it so it is 1/8 away from ground.

Go try that stuff.
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Old 08-13-2007, 01:40 PM
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If you do get the coil to spark from doing the above; go buy a NEW set of points and a NEW condenser.

Some of us would try cleaning them, but let's skip that.
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Old 08-13-2007, 03:54 PM
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Not to be a wise guy, but that is why I switch to HEI on them.
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Old 08-14-2007, 11:57 AM
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that is what i am doing, turns out the parts truck i got has HEI on it so know i just got to teach myself to time it

and i already tried your idea there F J, it didn't work but instead of a coil i am going to the HEI
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