97 TJ Voltage Regulator Failure - Page 2 - JeepForum.com
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post #16 of 20 Old 11-13-2016, 09:53 PM Thread Starter
SmashinTJs
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Alright guys, sorry for the delay. I have been having probation midterms at work (Im a firefighter) so studying to pass the tests and keep my job had taken priority over fixing the jeep, until now.

I found a ECM (Same as a PCM as far as I know?) from a 2004 Wrangler 4.0 5 speed (same as my 97) for cheap at a junkyard.

Before I buy the junkyard ECM I want to make sure than the ECM from an 04 is compatible with my 97. Does anyone know for sure?

Additionally, is there anything besides swapping the units that needs to be done? Im not too familiar with this swap.

Thanks again everyone,

Steve


RED 1997 Modded TJ l 3.5 Rancho l PIAA's l 33'' KM2 l Custom Yakima Roof Setup l Armor l.

TJ TECH BOOT CAMP: READ IF NEW


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Is that bumper weighted to keep you from catching air at highway speed?
Quote:
Originally Posted by NorthWhiteWolf View Post
Well no (why would it) :confused:
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Because I think your fender flares could easily pass for wings
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post #17 of 20 Old 11-13-2016, 10:25 PM
Knuckelhead
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Your 1997 and the 2004 PCM are not compatible...
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post #18 of 20 Old 01-27-2017, 06:55 PM Thread Starter
SmashinTJs
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So after a couple months of slowly working on stuff and waiting for a little bit of extra money I am back to working on the Jeep.

I have installed this kit: http://store.alternatorparts.com/hd-...ement-kit.aspx

and I believe that everything is properly connected. My power source is a piggy back fuse to a 10amp in the glove box.

My Jeep will now run again but after about 30 seconds the voltage on my cluster spikes above 19 and my check guage light comes on. The dash lights also pulsate as well as my headlights.

I have touched a multimeter to the ground points the regulator and the alternator and my voltage reads between 14-14.8 every location that I touch. The kit includes the FRM piece that is supposed to be connected between the wires that run back to the PCM. I have not used this piece but my understanding of this kit is that the FRM is strictly for fooling the computer into thinking the system is normal and keep the CEL off. My CEL is not on despite not using the FRM (yet).

Could I just be getting a false reading on the dash gauge? Maybe bad ground somewhere?

I would prefer to not start a ripping electrical fire.....

It would appear that I am one step closer to fixing the problem but that I am not out of the woods just yet.

RED 1997 Modded TJ l 3.5 Rancho l PIAA's l 33'' KM2 l Custom Yakima Roof Setup l Armor l.

TJ TECH BOOT CAMP: READ IF NEW


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Quote:
Originally Posted by scavanau View Post
Is that bumper weighted to keep you from catching air at highway speed?
Quote:
Originally Posted by NorthWhiteWolf View Post
Well no (why would it) :confused:
Quote:
Originally Posted by scavanau View Post
Because I think your fender flares could easily pass for wings
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post #19 of 20 Old 01-27-2017, 09:16 PM
Rubi4MyMrs
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Try reading through this link. Especially posts 14 & 18. Where you tap the power for the regulator matters according his experience.

https://www.jeepforum.com/forum/f9/vo...ulator-3964897

Then report results.
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post #20 of 20 Old 01-27-2017, 09:36 PM Thread Starter
SmashinTJs
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Quote:
Originally Posted by Rubi4MyMrs View Post
Try reading through this link. Especially posts 14 & 18. Where you tap the power for the regulator matters according his experience.

https://www.jeepforum.com/forum/f9/vo...ulator-3964897

Then report results.
Just read through this thread. Thanks for sharing.

He was getting voltage readings above 15 though and I have not. So im not sure why my voltmeter in the cab would be "maxed out" (which is >19 volts). Im not getting a reading that high anywhere in the system that I can find.

RED 1997 Modded TJ l 3.5 Rancho l PIAA's l 33'' KM2 l Custom Yakima Roof Setup l Armor l.

TJ TECH BOOT CAMP: READ IF NEW


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Quote:
Originally Posted by scavanau View Post
Is that bumper weighted to keep you from catching air at highway speed?
Quote:
Originally Posted by NorthWhiteWolf View Post
Well no (why would it) :confused:
Quote:
Originally Posted by scavanau View Post
Because I think your fender flares could easily pass for wings
SmashinTJs is offline  
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