More overdrive questions

[SAndreasen]

Is there a fuse for the overdrive lockout
1999 3500

 

[BigPapa]

All I find in any electrical diagrams pertaining to the OD Switch:

The OD Switch has two wires, Black/Light Green goes to a ground, Orange/White goes to pin 13 of the C-3 (gray) connector on the PCM, “Trans OD Switch Sense”.

Fuse 1, 10amp, in the PDC powers the Trans Control Relay.

 

[SAndreasen]

Is there a fuse for the overdrive lockout
1999 3500

So I could have popped it by changing the switch around . It was working but only in park so I turned the switch over and now it won’t work

 

[SAndreasen]

How do you get to the wires in the switch

 

[BigPapa]

I doubt the switch is your problem. It’s a very simple momentary push switch. It doesn’t even have a spring in it. What you have in your pic is the socket and attached wiring and the switch still in the socket.

If you pull the little bezel off the end of the shifter and then grab the switch with a pair of pliers, the socket should stay in the shifter and it will look like this.

This is the switch.

Gently lift the two tabs, one on each side, and the switch separates into three pieces, the shell, the button, and the switch itself.

The gray is a soft silicone that is held on by the little black pins and a couple of “darts” on the bottom side of the gray piece. Inside the gray piece is a round metal contact. On the green circuit board material disc is the split contact area that’s soldered to the pins that go into the socket. When you push the button, it pushes the round contact in the gray part down to the split area on the board and completes the circuit, commanding OD off or on in the PCM.

If your switch only works in Park, I’d say you have a damaged wire that’s pulling apart when you shift into drive.

 

[SAndreasen]

I replaced the switch the old switch wouldn’t close or showed no continuity the new one does . But I pulled the wires out of the leaver. I guess pull the covers off the steering column and then I hopefully can repair the wires

 

[BigPapa]

My switch got where it wouldn’t work, too. I disassembled it and found dirt and corrosion on the contacts. Cleaned it off and it works great again.

 

[SAndreasen]

I think I saved the old switch . But the new switch is working just need to redo the wiring inside the levee

 

[SAndreasen]

Well I couldn’t find any wire small enough to splice and fit back down through the shift lever so I spliced in a couple lengths of 18 gauge and relocated the button to an Empty hole in the dash . Eventually I will probably order a new handle and wiring harness

 

[BigPapa]

 

[SAndreasen]

Well it works for now it’ll be ok