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Old 06-24-2014, 02:54 AM   #11
Deerhurst
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My early 86.5 truck doesnt have the dial, which I am assuming is a potentiometer. It only has a switch. Mine has also never made any indication for multiple modes like most of the guides suggest.

For the early ones I think it would be easy. I would probably make a blinky light pod for my rig if you have a diagram and show what is safe and what is not.
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Old 06-24-2014, 03:12 AM   #12
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My 87 FSM shows the switch as well, but you should still be able to get the 5 modes, if you move your switch and wait the lights should blink the number of times indicating what mode it is in.
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Old 06-24-2014, 03:37 AM   #13
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does this help at all?

http://codes.rennacs.com/plugins/Nis...-15-Lucino.php
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Old 06-24-2014, 05:18 AM   #14
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Quote:
Originally Posted by ahardb0dy View Post
Where are you finding the wiring diagrams? Are they in the FSM? Is the check connector like the guy used the one behind the fuse box in the trucks?

Looks like you only need 5 wires to make it work anyway.
One of the diagrams is in my 87 FSM, the other 2 I had printed while working at NAPA.
The check connector (CONSULT port) is hidden behind the fuse panel in the (W)D21s.

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I wonder if you switch the ECU into one of the diagnostic modes and probe the check connector if you would get anything at the plug, like when the red LED was flashing if it would trigger a test light at the check connector?
Exactly. In fact, the CA models drive the MIL directly from the output pin for the red LED. However, the resistance of the test light may damage the ECU.
5 wires - one each for signal to red and green LEDs, one for ground, and two for a normally open SPST push button switch to trigger the modes.
I may post a thread asking for some verification of pins and wiring colors to assist in this project.
Not sure if this would work on OBD-II systems...
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Old 06-24-2014, 11:48 AM   #15
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I think this would be a good thread topic.

I only troll in the Hardbody subforum, so if you start a thread someplace else, please post the link.
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Old 06-25-2014, 10:15 PM   #16
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Quote:
Originally Posted by ahardb0dy View Post
My 87 FSM shows the switch as well, but you should still be able to get the 5 modes, if you move your switch and wait the lights should blink the number of times indicating what mode it is in.
If I remember right mine just go lit till I throw the switch back the other way. Ill have to take another look to confirm. I think on mine I just flip the switch, flip it back and it displays any codes.
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Old 06-26-2014, 12:55 AM   #17
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from what i remember, mine is like what Deerhurst described.
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Old 06-30-2014, 04:15 AM   #18
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Got a couple things boxed up to ship out...got rear speakers mounted and hooked into radio and carpet hung on back of cab. Also did some research on remote mounting my ECU lights - lights seem to work at connector, but no way to trigger modes - yet.
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Old 06-30-2014, 05:05 AM   #19
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"Also did some research on remote mounting my ECU lights - lights seem to work at connector, but no way to trigger modes - yet."

Been waiting to hear someone update on this. Wish my truck was here I would look into it too.
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Old 06-30-2014, 11:54 AM   #20
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Quote:
Originally Posted by Midnight Tech View Post
Got a couple things boxed up to ship out...got rear speakers mounted and hooked into radio and carpet hung on back of cab. Also did some research on remote mounting my ECU lights - lights seem to work at connector, but no way to trigger modes - yet.
I was wondering how to make that rheostat style turn knob work, too.

Lights are just basic. Getting that Pot moved to the dash requires some details.

How many wires will it take, all together? I'm planning to replace my floor mats this 4th of July weekend, and if I know how many wires go to it, I can run those now so I won't have to fish that crap under the mat later.
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