93' 5.9L Magnum no spark SOLVED
#1121740
11/26/11 03:09 PM
11/26/11 03:09 PM
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Joined: Jan 2003
Posts: 4,867 Upstate, NY
MikeP
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,867
Upstate, NY
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93' W2250 5.9L Magnum
Getting my plow truck ready for winter, been parked since April. Turned key, nothing, left key on crossed starter terminals and fired up, ran great. Backed it into shop, shut if off, again no crank. Pulled starter, cleaned termials, bench checked OK. Reinstalled, no crank. 5 pin starter relay wasn't working, cleaned terminals, still nothing. Had an 4 pin from an 88', plugged it in, it cranked over, wouldn't start, no spark. Put original 5 pin back in, cranks over, no spark
Pulled spark plug, no spark, pulled plug going into coil, no voltage at plug when cranking. Checked all fuses, ok.
Could it be a crank position sensor?
Any other thoughts? Appreciated.
Last edited by MikeP; 11/27/11 09:17 PM.
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Re: 93' 5.9L Magnum no spark
[Re: Andrewh]
#1121744
11/26/11 10:19 PM
11/26/11 10:19 PM
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Joined: Sep 2005
Posts: 12,481 Chino Valley
RodStRace
I Live Here
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I Live Here
Joined: Sep 2005
Posts: 12,481
Chino Valley
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4 or 5 are RELAYS. Not good to swap unless they are the same! Put a test light on positive coil terminal with wire connected. Crank and leave key in on position. Should have power. If not, look upstream according to the wiring diagram. IF it has power, put light on neg side. Should flash cranking.
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Re: 93' 5.9L Magnum no spark
[Re: MikeP]
#1121746
11/27/11 10:57 AM
11/27/11 10:57 AM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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Check the main harness under the power distribution block beside the battery.It is a heavy harness that splits into a Y.Untape it at the Y,there are three wires crimped to one wire,think they are red and white but can't remember for sure.The connector was prone to coroding,sometimes made contact,sometimes didn't.Whether it's bad or not,remove the connector,solder and heat shrink the connection.If that is not your problem,it will eventually be one.
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Re: 93' 5.9L Magnum no spark
[Re: MikeP]
#1121748
11/27/11 04:19 PM
11/27/11 04:19 PM
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Joined: Oct 2010
Posts: 392 Doniphan, Nebraska
Lmopar69
enthusiast
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enthusiast
Joined: Oct 2010
Posts: 392
Doniphan, Nebraska
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X2 on what 62maxwgn said. I just had a similar problem with my sons 93 Dakota. Opened up the wiring harness from the relay box, found the red/red-white wires that were 3 into one, cleaned them, re-soldered and sealed it up. Didnt fix the problem. moved forward in the harness, and found a ground that was basically sheet metal screwed to the inner fender (between the battery and the relay box. Cleaned the ground, tightened it up. problems solved.
Laine.
NRCA Member
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