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Unread 01-07-2012, 06:37 PM   #1
Hemi2000
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1993 Wrangler Electrical - Starting Issues

Hello, I'm a new member here. I just purchased a 1993 Jeep Wrangler from a friend. It's a 6 cyl automatic, sold new in California.

It is pretty much all original and has no obvious modifications to the engine or electrical system. My friend said it ran good before but one day he had a dead battery and tried to jump start it, he accidentally reversed the cable connections and things got hot in a hurry! He saw smoke and unhooked everything. It seems that a wire somewhere got hot and possibly melted but nothing appears damaged.

Now the car does not get any power from the (now charged) battery and will not attempt to start. I found a couple blown fuses and replaced them, no other obvious issues, same results.

Where do I start? Help!

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Unread 01-07-2012, 08:23 PM   #2
Mark05059
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are you getting any cranking of the engine at all?
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Unread 01-07-2012, 08:42 PM   #3
laybackman
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Quote:
Originally Posted by Hemi2000 View Post
Hello, I'm a new member here. I just purchased a 1993 Jeep Wrangler from a friend. It's a 6 cyl automatic, sold new in California.

It is pretty much all original and has no obvious modifications to the engine or electrical system. My friend said it ran good before but one day he had a dead battery and tried to jump start it, he accidentally reversed the cable connections and things got hot in a hurry! He saw smoke and unhooked everything. It seems that a wire somewhere got hot and possibly melted but nothing appears damaged.

Now the car does not get any power from the (now charged) battery and will not attempt to start. I found a couple blown fuses and replaced them, no other obvious issues, same results.

Where do I start? Help!
First off you sent voltage with amperage through the ground system of your entire electrical system. That is not good.

First thing; what exactly does "will not attempt to start mean" in plain third grade English?? Does it make any noise or does it turn the engine but not start??

You need to do is get the starter system to respond. Right now the starter is not making any noise what so ever.


You checked/replace fuses...which ones? Where were they? Did you check the start relay in the PDC under the hood? See if your horn works. If it does swap that relay with your starter relay. See what that does. In fact if you horn does work check every relay you have in the horn relay position.
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Unread 01-08-2012, 04:57 PM   #4
Hemi2000
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Ok, I checked the battery connections again, both were loose. I cleaned up the posts and cables and secured everything properly (before I had a dead key, nothing when turned, no lights, horn, starter, etc. just dead).

Now I have interior lights (horn does not work) and the starter motor engages, turns the engine over and all sounds normal.....However the engine just cranks over and does not fire at all, I have fuel and suspect it lacks spark.
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Unread 01-08-2012, 05:33 PM   #5
laybackman
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Quote:
Originally Posted by Hemi2000 View Post
Ok, I checked the battery connections again, both were loose. I cleaned up the posts and cables and secured everything properly (before I had a dead key, nothing when turned, no lights, horn, starter, etc. just dead).

Now I have interior lights (horn does not work) and the starter motor engages, turns the engine over and all sounds normal.....However the engine just cranks over and does not fire at all, I have fuel and suspect it lacks spark.
Forget the horn for now... Humor me if you don't mind. Slide underneath the YJ and remove the electrical plug from the VSS sensor mounted on the transfer case. See if it starts then.
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Unread 01-08-2012, 07:46 PM   #6
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Ok, tried that, no change. I do smell fuel now (flooded from cranking).
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Unread 01-08-2012, 08:11 PM   #7
laybackman
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Originally Posted by Hemi2000 View Post
Ok, tried that, no change. I do smell fuel now (flooded from cranking).
Check out this thread:
http://www.jeepforum.com/forum/f12/n...oblem-1294163/

Rat had the same problem with his '95YJ. Your '93 is essentially the same except wire colors are probably different. You can see what you are possibly up against.

After it all the VSS was shorted internally collapsing the 8 volt supply to it and two other sensors.
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Unread 01-09-2012, 06:02 AM   #8
Que89YJ
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Do you see the check engine light on the cluster when you turn the key and does it go out after 3 seconds?
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Unread 01-15-2012, 04:46 PM   #9
Hemi2000
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Success! It was a bad coil, swapped it out and she started right up!
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