OK so WTF did I do wrong now? 2nd gear switch please help!

As I mentioned before, the article on Bigoffroad was wrote by myself, works great hundreds have followed it and the same success. When I wrote the article I used a genuine chrysler service manual not a Haynes, D16 is correct.
 
Thanks Tony! I'm at work now, but on my way home I'll stop and pick up a regular toggle switch, and wire everything back up again.

Will have the results in a couple hours!
 
Christopher said:
Check the 7.5 amp tranny fuse. I had a similar issue and that is what it turned out to be.
Click to expand...

Any idea where that is at?

There is a 10 amp inline fuse taped up to the TCU wiring harness. Is this the one, but just the wrong size?
 
OK, so I wired everything back up, but this time with just a simple toggle switch. I did not use a diode.

Took it for a drive, and it works just as it's supposed to!

Got back home, and installed the diode, with the grey circle pointing towards the harness connecter. Took it for another drive, and got basically the same results as last time. It skipped 2nd gear, and wouldnt shift into OD either.

I took out the diode, and all works fine again. Can any damage be caused by not using one? The go-jeep write up says he's been for years without one, and no negative effects.

Thanks
 
The drawing is incorrect,the "verbage" about the diode is "correct".The doide in the schematic is drawn in the wrong direction!
AW41.JPG
 
I wasn't really sure which way that diagram had the diode pointing. I had it going to the grey circle was pointing towards the TCU harness connecter on C15.

Anyway, I do still have a couple of questions....

When I'm taking off from a stop in the 1 - 2 position, and I flip the switch so I'm in second gear, how would I shift up to 3rd gear? Just move the shifter forward, and turn the switch off? What happens if the switch is left on?

What happens if the switch is turned on in the "D" position? What about in the "3" position?


Thanks for the help!
 
90Pioneer said:
I wasn't really sure which way that diagram had the diode pointing. I had it going to the grey circle was pointing towards the TCU harness connecter on C15.

Anyway, I do still have a couple of questions....

When I'm taking off from a stop in the 1 - 2 position, and I flip the switch so I'm in second gear, how would I shift up to 3rd gear? Just move the shifter forward, and turn the switch off? What happens if the switch is left on?

What happens if the switch is turned on in the "D" position? What about in the "3" position?


Thanks for the help!
Click to expand...

Yes, to go to third just move the shifter to that positon. The mod will have no effect on that position. When in the Drive position, if the switch is on, the tranny will stay in 3rd gear and will not shift to overdrive due to the power that is applied to solenoid valve. NO Harm will be done. So, it's kinda cool, if you are crusing and want to shift out of 4th you can either move the shifter to 3rd or leave it in D and flip the switch. Nothing will happen won't hurt anything. I'll correct the diode on the drawing. My bad.
 
Cheapjeep2 said:
Yes, to go to third just move the shifter to that positon. The mod will have no effect on that position. When in the Drive position, if the switch is on, the tranny will stay in 3rd gear and will not shift to overdrive due to the power that is applied to solenoid valve. NO Harm will be done. So, it's kinda cool, if you are crusing and want to shift out of 4th you can either move the shifter to 3rd or leave it in D and flip the switch. Nothing will happen won't hurt anything. I'll correct the diode on the drawing. My bad.
Click to expand...


Thanks for the help Tony. I'd probably be still right where I was. You might want to mention in your write up not to use a lighted switch.

Do you have any idea as to why I got the same results with the toggle switch, and the diode installed? I'm pretty sure it was was installed correctly.

OK, so current is supposed to flow the way the arrow is pointing in the wiring diagram, right? And if the wiring diagram showed it pointing the wrong way, I *did* have the diode installed correctly. Why did it not work right?

Thanks again!
 
Last edited:
All the diode is going to do is prevent voltage from going back into the computer, you can run with out, I did for over a year. You want the diode installed so voltage or signal from the computer can still flow to the tranny. If you are not sure about the diode take a multimeter or even a 12 volt led or bulb and make a simple circuit from the positive battery post to ground to verify which way the diode will allow voltage to flow. So if you connect one end of the diode to the positive battery post, then use a meter or a bulb on the other end and then complete the circuit to ground. The meter will read 12 v or the bulb will illuminate. If it doesn't flip the diode. When you get a reading or illumination, note which end of the diode is connected to the positive terminal of the battery. The side of the diode that was connected to the battery will be the side that should be connected towards the TCU. If you flip the diode and never get any result, your diode is bad. BTW, the name's Troy not Tony, but no worries.
 
Cheapjeep2 said:
All the diode is going to do is prevent voltage from going back into the computer, you can run with out, I did for over a year. You want the diode installed so voltage or signal from the computer can still flow to the tranny. If you are not sure about the diode take a multimeter or even a 12 volt led or bulb and make a simple circuit from the positive battery post to ground to verify which way the diode will allow voltage to flow. So if you connect one end of the diode to the positive battery post, then use a meter or a bulb on the other end and then complete the circuit to ground. The meter will read 12 v or the bulb will illuminate. If it doesn't flip the diode. When you get a reading or illumination, note which end of the diode is connected to the positive terminal of the battery. The side of the diode that was connected to the battery will be the side that should be connected towards the TCU. If you flip the diode and never get any result, your diode is bad. BTW, the name's Troy not Tony, but no worries.
Click to expand...


Here's a pic...

diodes.gif


I assume power flows from left to right in this picture, correct? The way I set it up, the part with the grey circle was pointed towards the TCU, should it of been flipped around?

Guess it's time I get a multimeter.


BTW, sorry about getting your name wrong, I'm bad with them.
 
90Pioneer said:
Here's a pic...

diodes.gif


I assume power flows from left to right in this picture, correct? The way I set it up, the part with the grey circle was pointed towards the TCU, should it of been flipped around?

Guess it's time I get a multimeter.


BTW, sorry about getting your name wrong, I'm bad with them.
Click to expand...

No worries about he name. I know how a diode works, but to be honest I use them so infrequently that I can never remember which way the current flows by the indicator. Just reverse it in the circuit and try it. It won't hurt anything at all.
 
That drawing posted by RCP PHX is different to what I have mine. Instead of using D16 which is hot as long as the ignition is turned on I use C8 which has power only the gear handle is in the 1-2 position. In that way I can be certain that the second gear solonoid will not be accidentaly energized when driving in any other gear. This has worked perfect for me for the 3 years I had my '94 XJ. The '96 is also modified and I have had no problems with it; at least not until the AW4 over heated.
My $0.02
 
90Pioneer said:
OK, so current is supposed to flow the way the arrow is pointing in the wiring diagram, right? And if the wiring diagram showed it pointing the wrong way, I *did* have the diode installed correctly. Why did it not work right?
Click to expand...
Two things,as strange as it might seem,current flow is opposite of the arrow(schematic diagram of a diode)!
Second,the actual markings on diodes can differ,but should come with paperwork,otherwise you need an ohmeter to check it!
 
RCP Phx said:
Two things,as strange as it might seem,current flow is opposite of the arrow(schematic diagram of a diode)!
Second,the actual markings on diodes can differ,but should come with paperwork,otherwise you need an ohmeter to check it!
Click to expand...


OK now I'm totally confused!!!!

http://www.kpsec.freeuk.com/components/diode.htm says the current flows the direction of the arrow

This site, http://www.allaboutcircuits.com/vol_3/chpt_3/1.html , says it flows the direction the arrow is not pointing

????
 
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