Re: No Spark 1987 Ingersoll 448
- turn the key to "ON"
- put your test light between a good, clean ground on the engine and the + terminal on the coil. Does the test light show that you have power?
- Remove the wire from the - terminal on the coil and put your test light on the same clean ground on the block and the - terminal. Do you have power? If so, good. If not, the coil is defective.
- But we are not through testing the coil just yet. Get a piece of electrical wire a couple feet long and bare both ends of it. Put one end to that nice clean ground on the block and then with the key switch still ON, touch the other end of that wire to the - terminal on the coil momentarily and then remove it. If you do this while the spark plugs are out of the engine, firmly grounded to the block and connected to the coil's high tension leads, you should see a spark develop across BOTH plugs at the same time.
This would indicate that both of the high tension coils inside the coil body are at least functioning.
From there, you need to turn your attention to the points and condensor as well as the wire that connects the coil to the points. That wire is often suspect. It can corrode or break internally as well as short out from an improperly installed points cover so examine it carefully. You can use your test light to check it for continuity by removing it and using it extend one of the test light leads while you go across the positive and negative battery posts.
If the points look badly pitted, why not just replace them along with the condensor? Gap the points as suggested. Reconnect everything and give it try by spinning the engine with the starter while watching for spark at the plugs that are still removed from the engine. If you finally have spark, then screw the plugs back in and snug them up. Put on the plug wires and try to start the engine.
Let us know how you make out and what the root cause was.