No spark off coil

Tiny
DHOLT
  • MEMBER
  • 15 POSTS
Got a new ECM. Hooked everything back up still no start or spark.
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Monday, April 8th, 2019 AT 3:41 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Let's go to the starter solenoid.

Pic 1) This is the way I wired my '46 Willys to be like my CJ 5. The wires on the big posts can be swapped (all of them from one side to the other side) (the big cable to the starter will swap too).

The pics that I post of both of my Jeep's solenoids have been swapped to opposing posts (factory is the other way) The solenoid don't care as long as everything is swapped.

When all is done, the starter is always by itself and the battery cable and those wires stay together on the opposite side.

"S" and "I" cannot be swapped.

Check!

Insure the starter solenoid's body has a good ground to the fender.

Insure the wires/ rings on the posts are clean, tight, and nothing has broke loose from a ring and is now dangling close by.

Test

I'm not sure if you are "Cranking" (not the same as "not starting"- Starting means running!)

See if this cranks you.

Remove "S" wire from the solenoid. Touch a temporary piece of wire from the Positive side of the battery to "S". Terminal of the solenoid.

Yep,

If it works, you probably wet your pants, the initial bump will startle you!

It should crank, verifying the solenoid is good.

Before you buy another one, verify the solenoid body is grounded well to it's home spot.

Now let's test "S" wire. Removed from the solenoid, stick your voltmeter probe in the wires socket. Your other lead will go to the negative side of the battery (as there's no better ground than at the source!). Now have your buddy turn the ignition switch to "start". We should get 12 Volts!

No? Let me know!

While we are at it, Turn your key to "on". Stick your probe onto the positive side of your coil.

What do you get?

Your turn!

The Medic
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Monday, April 8th, 2019 AT 6:24 PM
Tiny
DHOLT
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Sorry for the long delay. Okay I get 12 volts to the "s" side of the solenoid and 12 volts on the positive side of it as well with the key in the run position. Mine is wired with a battery kill switch that wouldn't make a difference would it?
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Friday, April 19th, 2019 AT 11:02 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
The battery kill switch should not affect you, unless it is not working.

Key on, positive side of the coil, voltage?

The Medic
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Friday, April 19th, 2019 AT 3:28 PM
Tiny
DHOLT
  • MEMBER
  • 15 POSTS
7.8 to 8.0 volts.
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Friday, April 19th, 2019 AT 3:42 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Coil volts look okay.

Are you testing for spark like picture 1?

Let's also look at "I" on the solenoid, does it make it's way to the coil and "tee" in with the resistance wire? (Picture 2)

The Medic
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Saturday, April 20th, 2019 AT 8:54 PM

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