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1984 Ford Bronco ignition

Tiny
CRAZYPEOPLEME
  • MEMBER
  • 1984 FORD BRONCO
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
When I crank the bronco it starts when I let go of the key it shuts off.I put new tumbler the box under the dash still shuts off when u release the key
Thursday, February 20th, 2014 AT 3:28 PM

2 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Sounds like you have a defective ignition resistor. A tap on the starter solenoid bypasses it during cranking. There were two different coil designs used in '84. I'm not sure what they used for a ballast resistor or resistor wire, if anything. Measure the voltage on the coil's positive terminal with the ignition switch on. If you find 0 volts, follow that circuit back to determine where it's getting lost.
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Thursday, February 20th, 2014 AT 4:28 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
CHECK YOUR FUSES TOO!

THIS JEEP CJ ANSWER I GAVE WILL EXPLAIN WHY IT "RUNS" WHILE THE KEY IS IN THE STARTING POSITION..........YOURS WORKS SIMILAR

https://www.2carpros.com/questions/jeep-cj5-1976-jeep-cj5-voltage-drop-at-coil

KEEP US POSTED.....OR IF YOU ARE STILL IN NEED....WE TRY HARD!

THE MEDIC
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Thursday, February 20th, 2014 AT 4:59 PM

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