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  #1  
Old 08-30-2011, 09:05 PM
Tjs Tjs is offline
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Default 91 Ranger Ignition Switch Problem

91 Ranger 2.3L - 5 Speed

Two weeks ago,started truck and made a noise in the engine. Tried to shut the truck off, but it wouldn't. It did part way shut down, but it was not dieseling. I turned the key on and RPM went normal. Tried to shut it off again, but it wouldn't. I was like it was half shut off!

Finally, got it shut down. Left it for a week. Then the next week, it ran fine, although I could hear this small noise sometimes when I started it, like something not quite disengaging.

Now it's the same problem this week. All of a sudden, it has no power. No Lights, Radio, Nothing. Battery is good. All fuses and relays are good. Continuity is good from the battery to starter solenoid. Any suggestion? Ignition switch? Anyone know where I can find a schematic of the ignition switch?

Any tips on how to do this would be extremely helpful.
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  #2  
Old 08-30-2011, 10:31 PM
Junkyard Dog
 
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Default Re: 91 Ranger Ignition Switch Problem

The red and light green wire (pin 11 and 12...the splice together down the line) goes from your switch to your ignition module (pin 1). It gives 12V through the ignition switch to the ignition module. When the module gets power from this wire it fires your plugs. When no power it should turn off your coils. This is an assumption based on the diagrams I've seen.

I would assume that the switch is making bad connections and isn't interrupting this wires power to your ignition module when you turn the key off.

Next time it doesn't turn off and check this wire and see if power is still going to the ignition module.

---------------------------
I just reread your post and I would most likely assume that your ignition switch is bad.

It doesn't say in my diagrams which wire is the supply line (I would assume Light Green, probably multiple ones). Any way there should be a wire or wires that have power no matter what and those should be the power ones.

Now for the "load" wires here is the ones that should have power at the certain positions:

RUN:

Black/Light Green
Brown/Pink
Red/Light Green
Grey/Yellow (2 of those)
Pink (should be two pink wires on one pin)

Purple/Yellow are grounded during start and so is the solid Grey ( I don't think you would have to check these).

----------

Ok so I found this from a 92 Ranger Diagram:



You could probably take the ignition switch out and test resistances across the pins.

When in the run position should have continuity between the Light Green pins and:
Red/Light Green
Black/Light Green
Grey/Yellow (both)

In the Start position between light green and
Red/Light Blue
Brown/Pink


NOTE you will have to move the slider lever to the right position.
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  #3  
Old 09-02-2011, 07:40 PM
Tjs Tjs is offline
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Default Re: 91 Ranger Ignition Switch Problem

I have been out of town for work so i wasnt able to read your post. You were correct though. I replaced the ignition switch and it was indeed the problem. It is important to have the right tork on the switch when you install it, otherwise it wont work properly. Thanks again for your help and the schematic !
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  #4  
Old 09-02-2011, 07:41 PM
Junkyard Dog
 
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Default Re: 91 Ranger Ignition Switch Problem

No problem
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