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We have checked the ignition system and only 3.5 volts when key is turned on. Won't start

Tiny
DENISE 91 MONTERO
  • MEMBER
  • 1991 MITSUBISHI MONTERO
  • 90,000 MILES
We have gone through and tested the coils, distributor and everything seems to be fine but only 3.5 volts at ignitition system when key is turned on. It won't start.
Monday, January 30th, 2012 AT 11:11 PM

10 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do this power the coil from the battery positive post and see what happens-if it does start up check the resistance wire from coil positive back to the ignition switch and also test the switch-
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Monday, January 30th, 2012 AT 11:35 PM
Tiny
DENISE 91 MONTERO
  • MEMBER
  • 6 POSTS
We tried that and it didn't start. It is 12 volts at the ignition switch but only 3.5 at the coil with the key on. What would cause this?
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Tuesday, February 7th, 2012 AT 3:12 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
That's not even enough to power the coil-check where the voltage drop is or tap into the circuit from coil to switch and see what happens. I dunno if you have a resistance wire
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Tuesday, February 7th, 2012 AT 4:54 AM
Tiny
DENISE 91 MONTERO
  • MEMBER
  • 6 POSTS
Should the positive wire from ignition be grounded when key is turned off?
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Monday, February 20th, 2012 AT 1:54 AM
Tiny
RASMATAZ
  • MECHANIC
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The positive wire from the ignition should go to the coil's positive terminal
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Monday, February 20th, 2012 AT 2:03 AM
Tiny
DENISE 91 MONTERO
  • MEMBER
  • 6 POSTS
With the key off and unplugged from the coil. We can go from the positive side of the battery to the positive wire of the coil and get 12 volts. The wire would have to be grounded to get 12 volts, should it be?
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Monday, February 20th, 2012 AT 2:13 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
No isolate it from ground-that's coming from the ignition switch-what you doing is bypassing the ignition switch
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Monday, February 20th, 2012 AT 2:18 AM
Tiny
DENISE 91 MONTERO
  • MEMBER
  • 6 POSTS
So the ignition switch does ground it? We can't get it to start and are thinking maybe it's the ignition switch.
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Monday, February 20th, 2012 AT 2:23 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It should be able to start unless you got another problem-are you getting fuel and spark?
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Monday, February 20th, 2012 AT 2:33 AM
Tiny
DENISE 91 MONTERO
  • MEMBER
  • 6 POSTS
Yes we are getting fuel and spark. Is that normal for the ignition switch to ground it? Seems like the positive is touching a negative somewhere to get the full circuit.
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Monday, February 20th, 2012 AT 2:36 AM

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