I have a 72 ironhead with a magneto for a curcit beaker I'm getting 12v at coil pack but I'm not getting spark pls help

turn on your ignition and see if you have 12v on the plus side of the coil. if you don't then see if you have 12v at the plus side of any injector. if neither have it, then you have to check your asd relay.

It's a grounding problem

nope if it bolts up make sure the wires are red (A) armature (F) field and battery pos + make sure u polarize the genny by making a jumper wire from (A) ON GENNY TO POSITVE ON BATTERY TILL IT SPARKS NO LONGER THEN CHECK VOLTAGE SHOULD PUT OUT 12V TO 14 V WHILE RPM IS 2000

i also have to the same problem when changing my coil pack i mixed up the spark plug wires leading to the packs and now it's idling rough...pls help

Hi,

Have you checked the magneto and the valves for the right gap size?

If you are getting a strong, blue, spark on a known, good spark plug, then the magneto is good. If the spark is weak (barely visible), then it is most likely the clearance or rust build up.

The easiest thing to do is check for rust on the surface of the magneto and the surface of the pick-up coil. Emery cloth is good for removing rust on both. Then check for the clearance between the pick-up coil and the magneto. The closer to the magneto, the more powerful the spark (but rotate the magneto to ensure it never touches). When you loosen the screws on the pickup coil to adjust, make sure you have a business card to place between the surfaces to keep them from touching. The strong magnet in the magneto will pull the pickup coil to itself. Tighten the screws and remove the business card. Check for clearance as you rotate the magneto.

The only thing that can go bad in a magneto situation is the pickup coil. So, if you're getting a spark, it most likely is not the pickup coil because it will either produce a spark or won't.

It all depends on the model of engine. If it is a twin engine doesn't it have two magnetos.Very unusual for both to go bad It will depend on the type of ignition(points or solid state) The wire going to the magneto could be the kill switch (kills when grounded) Disconnect it and see if you get spark. IF so then it is in your safety/ignition circuit. If you replace magneto usually the gap is .008-.012

hi buddy to check the magneto just find the wires from the magneto and test them out with a volt metre if you have nothing there must be the stator plate gone get back to me buddy

Check the wiring and make sure your getting 12V to the module (under the coil packs) when the ignition key is turned on. If you have 12V then ohmmeter the coils. The primary side is like .5-1.5 ohms and the secondaries are in the 7500 ohm neighborhood. If all this checks out OK the module would be the culprit.

NO SPARK IS USUALLY CAUSED BY THE COIL PACKS OR MAGNETO