Jake brake?
Posting Guru
Joined: Dec 2003
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From: South Texas Coast
I have been to Steves site many times in fact its where I first found out about ensuring TC lock up. I sent him an e-mail asking how to locate the TC lock up circuit I am posting his reply below:
Unfortunately I have only posted the mod on my site I did not do the jake
brake myself.
Post this question to the board
BAZ...
so once again how do I find the TC lock up circuit?
Unfortunately I have only posted the mod on my site I did not do the jake
brake myself.
Post this question to the board
BAZ...
so once again how do I find the TC lock up circuit?
Posting Guru
Joined: Feb 2004
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From: IOWA
Yep, it's the purple wire w/ yellow tracer, coming from the right side of the transmission. Splice into that wire to a switch, then to a ground. You can also have an LED hooked up so you can see whenever your TC is locking up. Here's a link of how I did mine. They say to splice into it by the plug, but I followed the wire to the front side of the cab because I couldnt' get to the plug with the heat shield from the exhaust being right there, it also resulted in less wire being strung out.
http://www.dieselinnovations.com/techfiles/tclockup.pdf
http://www.dieselinnovations.com/techfiles/tclockup.pdf
Senior User
Joined: Dec 2004
Posts: 245
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From: Peshastin, Wa.
I was a little confused when I first started reading about the exhaust brake. I understand the priciple, I had an Izuzu 2 ton dump truck (with the 7.8 I believe) straight 6. It had an exhaust brake you could turn on or off. My '97 PSD acts the same way, when I let off the throttle it starts slowing way down, you can really feel it, especailly without a load. Sometimes I barely have to apply the brakes until I'm almost at a stop. I was thinking this is how all PSD's are set up, but begging to think whoever had the truck before put this setup on it. Any thoughts?
Posting Guru
Joined: Dec 2003
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From: South Texas Coast
OK let me be sury I have this straight all you have to do is ground the P/Y wire in the tranny bundle to lock up the TC.
I figred you would have to supply power to it evidently I was wrong.
I am just asking cause I dont want to torch the PCM
I figred you would have to supply power to it evidently I was wrong.
I am just asking cause I dont want to torch the PCM
Posting Guru
Joined: Oct 2004
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From: Morgantown WV
By my diagram you would put power to it. The #1 shift, #2 shift, converter clutch and the coast clutch are all grounded together with the red wire.
Check the P/Y for power when running. If no power tap into it and run the wire inside to a small bulb, ground as needed. The bulb should light when the converter locks.
Check the P/Y for power when running. If no power tap into it and run the wire inside to a small bulb, ground as needed. The bulb should light when the converter locks.
Last edited by mech2161; Feb 13, 2005 at 11:16 PM.
Posting Guru
Joined: Oct 2004
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From: Morgantown WV
Check the P/Y with a bulb as stated before. If it has constant power you would ground it, if not you would put power to it with the rectifier diode. I have not done this, my truck is a 6spd.
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Posting Guru
Joined: Feb 2004
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From: IOWA
Originally Posted by badabing
OK guys,who is correct here on the T/C lock-up.on the P/Y wire do we need 12v or do we ground,big difference???????Thanks
New User
Joined: Jan 2005
Posts: 13
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OK guys I just finished my convertor lock up switch,Tapped in to P/Y wire at grey plug under master cyl.to sw.and from sw. to ground---- works great,thanks for everybodys input.Next I am going to tackle the ehx.brake mod.,not tonight but at a later date,Thanks again folks.
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