indicator light for TC lockup

[FMcClaren]

Hi all
Would it possible to put a indicator light
to tell when your in lockup? Not sure why
i even need it but it might be interesting.
I could always tell when it locked on my
98 gaser, i can,t on the 01.
Maybe i just need to pay closer attention.
Thanks for any help
Mac B

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01 2500 Bright silver QC A/T 4x4 LB 3. 54 50 gal. tank tool box combo. Autometer gauges. Full length DC boards. DC flip out towing mirrors. chrome exhaust tip, front bumper S/S inserts. Reese 5th wheel hitch. 25 ft. Joyco eagle 5th wheel.

 

[Evan A. Beck]

Pretty easy to do, actually...

Just tap a wire onto the OR/BK wire in Pin 11 in the center plug of the PCM. Run this wire to one side of an LED, and run 12V+ to the other side of the LED. When the PCM tells the TCC to engage, it grounds the BK/OR wire and will illuminate the LED you installed. Easy as that. #ad

 

[FMcClaren]

Thanks Evan
I thought that would do it but i didn,t know
if it would trip a code or not.
Thanks again
Mac B

 

[bdaniel]

I did the LED trick a couple of months ago. Working fine with no problem.



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2000, Driftwood, 2500, automatic, 3. 54, 2WD, LWB, SLT, Quad Cab, most of the options, Grover air horns, no muffler, Banks Git Kit, ISSPRO guages, tow 5500lb 28'x8' Aerolite TT and two small boys.

 

[EMDDIESEL]

Where do you find that plug?

 

[John]

EMDDIESEL, Evan stated where to find the appropriate wire in his previous post:

Originally posted by Evan A. Beck:
tap a wire onto the OR/BK wire in Pin 11 in the center plug of the PCM.

(i. e. , center connector of the three PCM connectors which is located behind the OE air box or just under your Psychotty Air in your case)

 

[Joe G.]

There is a point you should be aware of. The LED indicates that there is a ground to the lockup solenoid. That does not necessarily mean that the TCC is actually locked. It will lock when there is a ground present AND there is sufficient pressure to cause a lock up. In most all cases it will be locked, BUT if you have some aftermarket modifications to the transmission controls it may not be. For example, if you are at idle throttle (going downhill) and you have a mystery switch to manually lock up the TCC just turning on the switch will NOT lock up the TCC. The led will be lit but with only idle pressure it won't be locked.

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Joe George
Eureka, CA

'95 2500 CC auto 4X4,3. 54,Combo EGT/boost guage,custom switch panel,PacBrake,TST #5,DTT TC/VB,Automatic motorhome steps on both sides,Foldacover hard bed cover,Cummins chrome kit,Black steel grill guard,Front hitch receiver