MULTIPLE Electrical Failure! - JeepForum.com
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post #1 of 21 Old 06-25-2020, 01:21 PM Thread Starter
DLYoung1
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MULTIPLE Electrical Failure!

So I hopped in the car this morning for a quick trip down to the neighborhood shopping center. When I got in to return home, I started realizing I had multiple "device" failures. Got it home and performed a rundown of everything working and not working. This is what I found:

1. The multi-function "Stick Switch" on the steering column
- Turn Signals - NOT working
- Front Wipers/Washers - NOT working
- Cruise Control - WORKING
- Flash to Pass (Brights Flash) - WORKING

2. Dash Controls
- Radio - NOT working
- A/C Control Panel - NOT working
- Lighter/Power Outlet - NOT working
- Rear Wipers/Washers - WORKING

3. Instrument Panel - Everything seems to be WORKING

What I have done so far:
- Pulled and checked every fuse in the block - ALL good
- Spent quite a while perusing the wiring diagrams for all systems in my Haynes Manual, looking for common power supply circuitry over multiple devices. No luck.

Friends, I am STUMPED. Where should I start troubleshooting? Could I have "lost" a grounding point for a bunch of stuff?

ANY pointers on where to start would be VERY much appreciated. Thanks!

DY


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post #2 of 21 Old 06-25-2020, 01:27 PM
Pinoy59
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I would just check your battery and ground first. There are at least 2 grounds in the engine bay.

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post #3 of 21 Old 06-25-2020, 02:05 PM Thread Starter
DLYoung1
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Thanks for the quick response! Yeah, I may have gotten too focused on voltage supplies and not grounds. Under the hood I'm finding two small ground points (the short cable direct from battery - to the inside of the fender well right next to the battery) and the other from the firewall to the driver side of the valve cover. Both look and feel good to me. Certainly nothing that looks like it could have been a direct fail without being at all intermittent.

Anybody: Is there an additional ground point somewhere under the dash?

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'93 Stock XJ, 4.0, 2wd, AW4 tranny
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post #4 of 21 Old 06-26-2020, 04:57 PM Thread Starter
DLYoung1
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Friday Afternoon Bump!

Guys and Gals, I could really use some some input here. I searched the engine bay and came up with three ground points to the firewall and the fender wells on both sides. All have been cleaned and tightened. Don't think that was an issue.

Quick recap: Lost multiple devices, all at once (no intermittent in and out).

Front wipers, turn signals, power to a/c control panel, radio, lighter/power outlet all dead.

Anybody got a place to look? I dismantled the dash today and found nothing out of place.

Help!

DLYoung1 in Texas
'93 Stock XJ, 4.0, 2wd, AW4 tranny
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post #5 of 21 Old 06-26-2020, 08:57 PM
2oldjeeps
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fuses AND relays. your haynes book is a good guide. ive used it to fix every wire problem ive had. it shows all ground points. i have RARELY EVER had a ground problem. some guys are obsessed with ground. trace voltage sources.you will find it...

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post #6 of 21 Old 06-27-2020, 05:22 AM
Jonny Jeep
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All of the things that are not working are on the same contacts in the ignition switch. Looks like a new switch would be in order. The non working circuits should have power in the run and accessory positions.
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post #7 of 21 Old 06-27-2020, 06:48 AM
kadetklapp
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Carefully inspect the wiring harnesses for rodent damage. Sudden onset makes me suspect a squirrel or something has chewed the main harness going thru firewall.

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Former Police Car assigned to 54-26, RIP.
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post #8 of 21 Old 06-27-2020, 07:31 AM
cruiser54
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Here ya go.
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Ignition Switch Location.jpg  
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post #9 of 21 Old 06-27-2020, 07:33 AM
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BTW, excellent job of communicating what works and doesn't.

Radio, turn signals, blower motor are the 3 that should point you to the burned brown wire on the ignition switch. Fairly common issue. Too much load on that circuit.
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post #10 of 21 Old 06-27-2020, 02:50 PM Thread Starter
DLYoung1
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Thanks for the help! I had completely forgotten about those circuits passing thru the ignition switch. Got the new switch in, but now I have a new bit of weirdness. All of the devices on that circuit are now "always hot"! I can turn on the wipers, turn signals, a/c and radio without the key even being in the switch!
Now, when I pulled the 2 mult plugs off of the old switch, one wire (purple) pulled out of the blue plug. I thought I reinserted it in the correct hole, but maybe I didn't?

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post #11 of 21 Old 06-27-2020, 04:46 PM
JWELK
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I have a 99 and this happens to mine every yr or so. A shot of WD 40 in the ignition key slot solves the problem
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post #12 of 21 Old 06-27-2020, 05:57 PM Thread Starter
DLYoung1
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Success! I guessed wrong on where that purple cable went back on the ignition switch terminal block. I moved it over one spot (to match the burned post from the old switch) and all is good, So apparently there is a "hot" terminal that will pass through battery voltage on that switch. Who knew?

Thanks to all for the input.

DY
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post #13 of 21 Old 06-28-2020, 05:35 AM
kadetklapp
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Quote:
Originally Posted by DLYoung1 View Post
Success! I guessed wrong on where that purple cable went back on the ignition switch terminal block. I moved it over one spot (to match the burned post from the old switch) and all is good, So apparently there is a "hot" terminal that will pass through battery voltage on that switch. Who knew?

Thanks to all for the input.

DY
So was just ignition switch?

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post #14 of 21 Old 07-06-2020, 09:23 AM Thread Starter
DLYoung1
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Monday Update! So, I got the new ignition switch in and (finally) patched correctly (that's another former repair story). All worked fine for about three days, but now I have a new anomaly that needs confirmation.

Blower circuit (ONLY - turn signals, A/C control, radio all still fine on that big ignition circuit) - I turn on the a/c, it runs for sometimes 5 min., sometimes 1 min., and the blower just quietly stops working. Again, I can feel the compressor is still engaged so it's just the blower. If I turn the a/c off for a minute or two, then back on, the blower comes back on for another "cycle". NO blown fuses.

First thought is the blower resistor block? Is it heating up and not passing current, then quickly cooling off when I turn the a/c off?
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post #15 of 21 Old 07-06-2020, 09:30 AM
JWELK
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Quote:
Originally Posted by DLYoung1 View Post
Monday Update! So, I got the new ignition switch in and (finally) patched correctly (that's another former repair story). All worked fine for about three days, but now I have a new anomaly that needs confirmation.

Blower circuit (ONLY - turn signals, A/C control, radio all still fine on that big ignition circuit) - I turn on the a/c, it runs for sometimes 5 min., sometimes 1 min., and the blower just quietly stops working. Again, I can feel the compressor is still engaged so it's just the blower. If I turn the a/c off for a minute or two, then back on, the blower comes back on for another "cycle". NO blown fuses.

First thought is the blower resistor block? Is it heating up and not passing current, then quickly cooling off when I turn the a/c off?
Tap the blower, sometimes just hitting the heater box will cause it to start.
Sounds like bad brushes on the motor, mine failed around 260K. Check YouTube on how to replace yours, I was able to get mine out through the engine compartment.
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