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Hey I have a 1990 F250 with a 5.8 and there is no spark. I went and got a multi-meter which says I'm only getting 5.6 volts to the ICM which it should be 12V. I was wondering if it could be the ECM since that is the next part down the line from the connector that plugs into the distributor. I already checked the EEC relay and it works. Thanks for any advice.
The power for the ICM comes from the Ignition switch and NOT the ECM or the EEC relay.
The same wire red wire with a light green stripe also powers the Ignition coil.
The power for the ICM comes from the Ignition switch and NOT the ECM or the EEC relay.
The same wire red wire with a light green stripe also powers the Ignition coil.
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I figured the wire that the ignition switch controlled might be the 12v at start wire in the #3 position which I get 12v at not the ICM power wire in the number 4 slot. I will get the ignition switch and let you know if the problem is cured and test the positive wire at the coil to see if that's is at 12v thanks.
Hey I was looking at your diagram and remembered that I picked up a manual at a location swap and shop for a $1. This is what I found and I see what you were saying about the ignition switch I replaced the ignition switch but still not 12V for the #4 ICM wire. I checked the #6 ignition ground and with key off its 12v when I put the positive probe to the battery but when I turn the key on I have 8v all the others wires tested 12v. Any other suggestions?
it's the ignition ground wire in the connector that plugs into the ICM. But that's when the key is on probing that wire with the black lead on the multimeter with the red probe on the positive terminal on my battery.
If the ICM is unplugged there is no ground on the Ignition ground wire going to the ICM as noted in the above posts. So 8V would be normal with a non loading meter.
it's the ignition ground wire in the connector that plugs into the ICM. But that's when the key is on probing that wire with the black lead on the multimeter with the red probe on the positive terminal on my battery.
You should always use the negative (ground) side of the battery to test any circuit. Otherwise your findings will be the opposite of what most publications post.
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