Engine/Transmission (1994 - 1998) auto to manual wiring help needed

[CTait]

Hi,I have nearly completed converting my truck from an auto to a NV4500. I cannot get the truck to crank over. I understand that I need to wire a relay into the existing auto wires to simulate the auto's nuetral sw. The function of the wires must change to both get the truck to crank,but then allow the cruise to work,as a full time nuetral signal will inhibit the cruise control. If anyone here knows how to do this I would very much appreciate an answer. Thankyou.

 

[Howard Durand]

I think you need to get a clutch pedal postion switch to replace the auto transmission neutral switch. It mounts on the clutch master cylinder push rod. Beyond that, I can't tell you much. From what I see in the service manual, it directly replaces the neutral switch for the auto transmission.

 

[BigPapa]

C,



We hooked up the switch that Howard is referring to on mine for the neutral switch. I haven't had any problems. You can contact a gentleman named Jim Leonard from the links section for advice. I am still running the auto electronic module so I still have the TPS in place for the cruise to work. You have to depress the clutch to start the truck no matter if your in neutral or not and the cruise will not shut off when you depress the clutch. Jim may have a way around that, though. I guess I'm just too lazy to make it right.



Scott

 

[Howard Durand]

From what I read in the manual, the clutch pedal position switch is an integral part of the clutch master cylinder push rod.

According to my service manual, there is an 18 gauge, yellow wire coming from the ignition switch that runs to a green receptacle that has a jumper in it for the automatic transmission. You need to remove that jumper and plug in the clutch pedal switch there. The output wire from that plug feeds the operating coil of the engine starter relay located in the power distribution center. The ground wire for the starter relay operating coil is black with a white tracer and is the one that runs back to the park/neutral switch on the auto transmission.

That wire can be cut and grounded anywhere.

 

[Dieseldemon]

If you hook the clutch hyd to the plug under the dash your cruise will not work. leave the jumper wire in place and cut the plug off of the clutch hyd master and run 1 side to ground and the other side to the wire in the middle of the connector that was on your auto trans that will ground the wire for starting and unground it for running if the wire is grounded all the time the computer thinks you are trying to start the engine and the cruise will not work.

Hope this helps

 

[BigPapa]

There ya go C! Straight from da man!



Scott

 

[Howard Durand]

Dieseldemon apparently has done this before. It looks like the only way it can be made to work with the clutch switch plugged into the green connector is to replace the PCM or do more extensive rewiring.

 

[Dieseldemon]

Bigpapa if you wire the clutch switch like I do the cruise will disengage when you depress the clutch as it grounds the switch and the computer thinks you are in park or you are trying to start the engine

Jim Sorry for the late response