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Ran fine changed transmission filter now it has no spark

Tiny
TAYLER SIMINGTON
  • MEMBER
  • 1996 DODGE TRUCK
  • 5.9L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
The truck always started and ran good, I pulled into my buddy's driveway to change the transmission filter after I changed the filter went to go on test drive it has no spark and no power to coil unless the negative battery terminal is off. I changed the crankshaft position sensor, the coil, and the pickup in the distributor still no spark.
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Thursday, June 9th, 2016 AT 7:41 PM

9 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Please explain this part better?

" it has no spark no power to coil unless the negative battery terminal is off"

The Medic
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Thursday, June 9th, 2016 AT 8:04 PM
Tiny
TAYLER SIMINGTON
  • MEMBER
  • 5 POSTS
I got a test light from Napa attached it to the plug going to the coil on the hot side cannot remember the color of wire. No power to coil with key in the on position no power with key while cranking the engine over with the test light still in I took the negative battery lead off and boom coil as constant power put negative lead back on no power to coil.
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Thursday, June 9th, 2016 AT 9:09 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,526 POSTS
So with the battery disconnected there is power at the coil?
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Saturday, June 11th, 2016 AT 4:45 PM
Tiny
TAYLER SIMINGTON
  • MEMBER
  • 5 POSTS
With the negative lead off yes
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Saturday, June 11th, 2016 AT 6:26 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,526 POSTS
So electrical power is present with no electrical source? That's a first for me my friend, let me know if you ever find out whats wrong.
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Saturday, June 11th, 2016 AT 8:22 PM
Tiny
TAYLER SIMINGTON
  • MEMBER
  • 5 POSTS
The positive lead is still on the battery
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Sunday, June 12th, 2016 AT 12:04 AM
Tiny
TAYLER SIMINGTON
  • MEMBER
  • 5 POSTS
But besides that. Changed the tranny filter Now it has no power to coil any ideas
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Sunday, June 12th, 2016 AT 12:25 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
The only way you can make a circuit is to have a battery in line with the battery terminal off as ken says this just wont happen, however. If the ignition is on and you make an earth through the test light, you will get a circuit but the globe will act as a resistance, some test lights are LED and will have a green and red light, depending on how they are hooked up an earth path will show with one light and power path will show with the other, can you give some more info on what you are testing with, because I am somewhat confused as well as to what you are doing to get the results you report.
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Sunday, June 12th, 2016 AT 3:46 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
One thing I forgot check fuses under hood and automatic shutdown relay they should be marked on cover for location
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Sunday, June 12th, 2016 AT 6:21 AM

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