1987 - 1996 F150 & Larger F-Series Trucks1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks
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im not getting any spark at the plugs. i had auto zone check my ignition module and it was fine. we also just got a new ignition coil. i have a volt meter and im getting some kind of power through all the wires leading to the distributor, but im really not sure how much voltage is even supposed to come out of the ignition coil. i have a spare ECC and i swapped it but it didnt help. my spark plug wires, distributer cap, rotor and spark plugs are all pretty new.
not sure if this is the correct way to test power coming out of the coil but i put a spark plug on the ignition coil wire and grounded the plug while turnin the engine over and i didnt get any spark out of it.
anyone have any idea what could be going wrong?!?!?! this has ben bugging me for awile.
ok i am getting 12 volts to the coil but i think there may be something wrong with the ground wire. when i take the ground wire out i get 12 volts of current off of it(negative), but when i plug it in the coil it doesnt read 12 volts negative it reads 12 volts positive. i did the spark plug test on the coil wire, and i didnt get any spark. i read the volts coming out of the coil wire (to distributor), 12 volts. and i really dont think the coil is bad because i replaced it, and the same thing is happening.
so basicly im not getting enough current out of the coil. and its acting strange.
Last edited by pmipmatt73; 07-16-2007 at 01:15 PM.
oh alright. so even though there is no spark coming out of the ignition coil....it still has something to do with the distributor? i think i kind-of understand because i looked at this and another (easier to understand) diagram from a haynes manual. ill try it and see what happens
thanks alot for your help.
2. my "key on" wire to the ignition coil is working. the other wire has 12 volts negative while its unplugged from ignition coil, turns into 12 volt positive when plugged into coil.
I have no idea what you are talking about here. There is not 12 volts negative anyplace on your truck.
The Ignition Switch puts 12 volts positive on the BATT side of the coil. Power flows through the coil windings and out the TACH side and is grounded by the TFI Module when it sees a PIP pulse and delays the grounding with information from the SPOUT. The TACH side sometimes has a (-) on it but this just meant it went to ground.
You may also want to burn the Haynes manual when you are done an get a good Ford Manual for your truck.
ok thank you for clearing that up for me i didnt know how it worked. what confused me is some mechanic cut off the plug leading to the ignition coil. now it has two wires that fit on it (not bare wire it has fittings on each end.) i just thought that that side was negative and the other was positive.
however i pretty much have a brand new ignition system that doesnt work. i have no idea why. and i cant find out whats wrong.
now that i dont have any parts to point the finger at... how would i go about checking the wiring system???
when i tested it the light turned on without turning the engine over or anything. and yes the light did kinda flash but i think that was because when i turned the engine over the starter drained up the power.
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