PRND indicator question...

[kewljay223]

anybody?

[Gus]

Man I can help you out but I dont have the wiring diagrams with me at work. I just went through all this and the MLPS/ PNP/ PRNDL what every you want to call it has 4 wires that you are well aware of. Signal A,B,C,P and depending on what gear its in the signals will be a combination of voltage or open which tells the display where the gear select is. I will try and hook you up when I get home but you will need to get the wiring/ connector and the switch that goes on the side of the transmission to make it work.

[Gus]

Untitled by Badger009er, on Flickr


Untitled by Badger009er, on Flickr


Untitled by Badger009er, on Flickr

Ok So here is what you can do.

If you found the original connector that goes with the switch and the colors match awesome. If not you will need to check continuity with a multimeter.

All of my connections went from the A, B, C, P from the main connector in the trans through a homemade pigtail to the MLPS switch on the side of the transmission.

All the indicators worked except for Park , 2, 1 and according to the first image I posted I had a problem with signal B not getting 12v when it should of. If you have the same problem unplug your main transmission connector and check your PRNDL indicator to see if its reading Park correctly. If so just run you B signal to the switch on the side of the transmission and disconnect it from the 13, 15, or 17 pin round connector going into the valve body.

Hope this helps you get moving again!

[shmiet]

I have the exact opposite problem that Gus had. I spliced the wires from the PNP plug(the 4 wire one) to the c200 connector. I only have Park, 1st and 2nd.
3rd, OD,N and R do not light up.

[kewljay223]

wow. thanks for the reply. thats great info. theres alot more to lighting up those stupid lights than you think. now which display are you speaking of? for the 88-98 OBS trucks right? as that is what i have. (95)

heres my problem.... the original connector, i cut it off.... its gone and im soley using the connectors that come with the LS harness. this is why im kinda screwed because now i dont know which wires they were going to the old computer... there are several of the same color. i have no idea to figure out which one is which due to the fact that the old computer doesnt have pinout numbers/labels. i dont want to be guessing and applying voltages on the wrong wires you know?

[shmiet]

Well obviously what i did isnt working properly. But from my understanding the 4 pin connector sends out A, B, C and P signals. Just search PNP plug 4l60e on google for a diagram, and splice those wires to the c200. So you will have them split to the LS ECM and to the c200. Wire colour should match. Hope this is some help. I dont know why my lights dont all work. I unplugged the signal B and Park, 1 and 2 still all work, but according to that diagram of hi and lo signals, nothing should light up.

[shmiet]

I talked to Brendan from lt1swap.com and he says the PRNDL is run directly from the tranny and does not run through the ECM on obs trucks. Newer digital ones obviously run through the ECM.