Ok, electrical geniuses got a puzzle for you

2006_LJ

2006_LJ

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Apr 24, 2021
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Long Island, NY
As I've posted on here before, I'm down a rabbit hole searching for a high charging alternator. Changed, PCM, Big 7 cable upgrade and a reman alternator — voltage still reads 14.8. But wait theres more!!!!!!!!! When doing the big 7 upgrade, I decided to look under my PCD and it looks like the PO did some funny wiring, which I undid while I was there to turn it back to stock. Not an electrical genius but I do know how to solder.

I wonder if undoing what the PO did is why, I am now having a crank but no start issue, intermittently — like I can crank it forever without turning over. Key word "intermittently"

Any ideas as to what he was trying to do? and if it relates to my problem? . — Red X is where the wire is cut, green line is where new wire is tapped/added

Also attached as PDF if its easier to read than the image

Untitled presentation.png
 

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That looks just a whole lot like the TSB 25-001-07 mod, an official Jeep mod for dealers (or owners) to perform to fix an emission monitor problem in the OBDII system. But your schematics look somewhat different from the 2005 FSM I used for mine. I think the 2005 and 2006 FSM are pretty identical on those schematics, so what schematic are you using? If the PO (or his dealer) did it right, and you undid it, you didn't do yourself any favors.
 
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If your OBDII system will never report that all emission "Monitors" are complete, you do that mod, and then it works right. Gets you to pass emissions inspection in those nasty states which use the full CA emissions standards, like CO (and a few others, I suspect).
 
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2006_LJ said:
I wonder if undoing what the PO did is why, I am now having a crank but no start issue, intermittently — like I can crank it forever without turning over. Key word "intermittently"
Click to expand...
Agreed, it looks like it had the TSB done.
Cranking without starting is also what you'll get when you wire a kill switch to the ASD relay.
 
2006_LJ said:
As I've posted on here before, I'm down a rabbit hole searching for a high charging alternator. Changed, PCM, Big 7 cable upgrade and a reman alternator — voltage still reads 14.8. But wait theres more!!!!!!!!! When doing the big 7 upgrade, I decided to look under my PCD and it looks like the PO did some funny wiring, which I undid while I was there to turn it back to stock. Not an electrical genius but I do know how to solder.

I wonder if undoing what the PO did is why, I am now having a crank but no start issue, intermittently — like I can crank it forever without turning over. Key word "intermittently"

Any ideas as to what he was trying to do? and if it relates to my problem? . — Red X is where the wire is cut, green line is where new wire is tapped/added

Also attached as PDF if its easier to read than the image

View attachment 374919
Click to expand...

That looks like the TSB was done to your Jeep. Check the voltage with a scan tool and see what it reads.
 
I'm not familiar with the TSM mod, so I can't comment on that, but I just wanted to mention 14.8V is not overcharging, or I'm misunderstanding something.
 
1. Thank you to everyone for responding, sorry I didin't get to this earlier, currently travelling for work. — I will check into that TSB and it looks very familiar to what my wiring was like — and Yes I am in NY so we have strict emission laws.

2. I was using this thing that kept saying my alternator is over charging — then using a multimeter I keep getting readings of 14.7-14.9 — also glad to hear this is OK!


1668042665879.png
 
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J.Pierce said:
Agreed, 14.4 is textbook I think, but in my opinion under 15 is still fine.
Click to expand...

Boiled my battery coming back from Colorado in August. I have the same issue. Weather the battery failed and shorted internally and the new battery will survive I don’t know. I have installed a external regulator for now until I can dig back into it.
 
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2006_LJ said:
1. Thank you to everyone for responding, sorry I didin't get to this earlier, currently travelling for work. — I will check into that TSB and it looks very familiar to what my wiring was like — and Yes I am in NY so we have strict emission laws.

2. I was using this thing that kept saying my alternator is over charging — then using a multimeter I keep getting readings of 14.7-14.9 — also glad to hear this is OK!


View attachment 375271
Click to expand...
Do you have a scan tool? I am interested in the voltage reading you are getting from the pcm through the scan tool.
 
NskLJ said:
Do you have a scan tool? I am interested in the voltage reading you are getting from the pcm through the scan tool.
Click to expand...

Do not have a scan tool, unless you mean the obd scanner ? Would really like to get to the bottom of this after all the work I put into it :(
 
NskLJ said:
Boiled my battery coming back from Colorado in August. I have the same issue. Weather the battery failed and shorted internally and the new battery will survive I don’t know. I have installed a external regulator for now until I can dig back into it.
Click to expand...

Do you have a dual battery set up?
 
14.8 volts shouldn't hurt anything. Most modern vehicle electronics use components that can handle much higher voltage. I wouldn't recommend it, but I've seen vehicle charging systems upgraded with dual 8 volts batteries for 16 volt base, charging at 18.5 volts using externally regulated Leese Nevil alternators, where they would boost the voltage up to 21 durring peak load useage, and the only issues experienced were some of the light bulbs / headlights didn't last as long as normal. The computerized parts are the ones most likely to have issues, but they should be fine to at least 16 volts. But like I said, I would never recommend doing any of this to anyone, but 14.8 volts is nothing to worry about.
 
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OldBuzzard said:
nasty states which use the full CA emissions standards, like CO (and a few others, I suspect).
Click to expand...

It's actually only about 6, maybe 7 counties in Colorado that do that. I get the feeling most of the people in those counties aren't even aware that their southern neighbors in Colorado Springs don't have to deal with that nonsense.
 
freedom_in_4low said:
It's actually only about 6, maybe 7 counties in Colorado that do that. I get the feeling most of the people in those counties aren't even aware that their southern neighbors in Colorado Springs don't have to deal with that nonsense.
Click to expand...

Just like folks don't know that we have counties here in CA where you don't have to get stuff smogged, at all.
 
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freedom_in_4low said:
It's actually only about 6, maybe 7 counties in Colorado that do that. I get the feeling most of the people in those counties aren't even aware that their southern neighbors in Colorado Springs don't have to deal with that nonsense.
Click to expand...

Yes, I always have to consider where a vehicle comes from in CO before buying. I would love to move somewhere farther from Denver.

mrblaine said:
Just like folks don't know that we have counties here in CA where you don't have to get stuff smogged, at all.
Click to expand...

True, I didn't know that.
 
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