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no spark to plugs


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zangle
Novice

Mar 9, 2013, 3:37 PM

Post #1 of 14 (1646 views)
no spark to plugs Sign In

1962,Ford Truck,F500, with an inline 6 cyl. I know the motor is mechanicly sound. Turns over good. Did not fire so replaced the points, rotor, condenser, cap, now even the coil. Points are gapped properly, wires are hooked up to the coil. Replaced ignition switch it was in poor shape ( bought a new quality one, original style ). Getting power to the coil when the key is on. Wire diagram for ignition system might help a lot, right now just guessing on that. Wire to coil from distributor is hooked up to the negative side of coil. Any thoughts........Thanks


Sidom
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Mar 9, 2013, 4:13 PM

Post #2 of 14 (1633 views)
Re: no spark to plugs Sign In

Maybe all the history on this might be helpful....

What was going on before it died?......Running good & just quit or wouldn't start up the next day...days....months????

Have you checked for spark & fuel?......Tested for power at the coil?


(This post was edited by Sidom on Mar 9, 2013, 4:14 PM)


zangle
Novice

Mar 9, 2013, 4:28 PM

Post #3 of 14 (1613 views)
Re: no spark to plugs Sign In

Yes as i said, there is power to the coil when the key is on. ( positive side ). The rig has been sitting for months or more. Need to get spark, not worried about fuel at this point.


Sidom
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Mar 9, 2013, 4:33 PM

Post #4 of 14 (1603 views)
Re: no spark to plugs Sign In

What was the voltage reading at the positive side? What gap did you set the points at? If you hook up a test light & touch the neg side of the coil & crank the engine,,,,does the light flash?


Discretesignals
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Mar 9, 2013, 6:32 PM

Post #5 of 14 (1588 views)
Re: no spark to plugs Sign In

Also make sure the rotor button turns when you crank the engine.





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zangle
Novice

Mar 9, 2013, 6:41 PM

Post #6 of 14 (1582 views)
Re: no spark to plugs Sign In

voltage reading with key in 'on' position reads 6 volts, cranking it over it reads 9 volts or so. Gap was set at 16 thou.
There is a reading of 000 on negative side when cranking over no power there at all.
Rotor is spinning properly.


(This post was edited by zangle on Mar 9, 2013, 6:49 PM)


Sidom
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Mar 9, 2013, 7:07 PM

Post #7 of 14 (1571 views)
Re: no spark to plugs Sign In

The voltage seems a bit low.......If I remember right, you would see around 9v in the run position. The ones that used a dual ballast resistor would have 9v in the run position & 12v in the crank position...

Have you ohmed out the coil yet???.....Check the primary side and make sure there isn't any continuity between the primary side & secondary side


Tom Greenleaf
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Mar 11, 2013, 12:49 PM

Post #8 of 14 (1531 views)
Re: no spark to plugs Sign In

Disagree Sid (first time) it goes thru a ballast resistor as this ign is based on a 6v system. Cranking not just key on should give whatever bat voltage is with the load on while cranking.

Still don't know why no spark so far so need more info. Coil test should show. If flooded out bad enough it won't spark. Been there done that,

T



Hammer Time
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Mar 11, 2013, 2:16 PM

Post #9 of 14 (1524 views)
Re: no spark to plugs Sign In

This system cranks on 12v and runs on 9v as Sidom said.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Mar 11, 2013, 2:28 PM

Post #10 of 14 (1517 views)
Re: no spark to plugs Sign In

When starter is working it wont be 12V...............!

T


Hammer Time
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Mar 11, 2013, 2:59 PM

Post #11 of 14 (1510 views)
Re: no spark to plugs Sign In

Of course the starter draw will pull it down some and that would be the main reason it's wired to bypass the resister during cranking but the coil is powered with full battery power during cranking and run through a resister to pull it down to 9v in run position.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



zangle
Novice

Mar 15, 2013, 8:37 PM

Post #12 of 14 (1475 views)
Re: no spark to plugs Sign In

Just to get back in the loop on this, It is a brand new coil........what other info can I gather for you?


Hammer Time
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Mar 16, 2013, 3:03 AM

Post #13 of 14 (1465 views)
Re: no spark to plugs Sign In

You need to make sure that you are using the correct coil. Some use Internal resisters and some use external. If you are only getting 9v to the coil in the "run" position, you don't want the coil to further reduce it. It should say internal or external resister on the coil.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



zangle
Novice

Apr 19, 2013, 5:00 PM

Post #14 of 14 (1383 views)
Re: no spark to plugs Sign In

Coil says external resistor.......Anyone? Unsure


(This post was edited by zangle on Apr 30, 2013, 7:21 PM)






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