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My 85 manual transmission 6.9l IDI backup lights don’t work.
wires and lights are good so I want to start at the switch and move back testing but can’t find the switch. The Chilton book says it’s either on the left side of the transmission or the engine compartment.
i have search both areas and can’t find a switch.
Anybody has to replace this or knows when to look?
Being you have a diesel and a manual trans I am guessing it is a T19?
If it is like the T18 & NP435 it is on the top plate of the transmission where the stick fits in.
From under the truck come in from the left and look up you should see a harness going from the frame rail harness to the top of the transmission.
This harness pushes onto the switch screwed into the top cover.
It should have power all the time with the key on, on 1 of the wires and the other goes back to the tail lights.
This is a T18 and the red thing in the top cover is the switch.
The NP435 is in the same place so I am thinking the T19 is too.
You did check the fuse?
Dave ----
IT looks like the one in your picture with the red plug but no wire harness is attached. No wire harness attachment is in the area. If that red plug is where it attaches it has been cut at some location and not around. Any ideas on what to do next?
IT looks like the one in your picture with the red plug but no wire harness is attached. No wire harness attachment is in the area. If that red plug is where it attaches it has been cut at some location and not around. Any ideas on what to do next?
thanks
Rich
Look on the frame rail for the cut wires. Should be a Purple/Orange wire and a Black/Pink wire.
IT looks like the one in your picture with the red plug but no wire harness is attached. No wire harness attachment is in the area. If that red plug is where it attaches it has been cut at some location and not around. Any ideas on what to do next?
thanks
Rich
Originally Posted by Franklin2
Look on the frame rail for the cut wires. Should be a Purple/Orange wire and a Black/Pink wire.
As DaveF said on the frame rail harness there is a plug that the transmission back up light harness plugs into, should be a 2 wire plug. 1 wire is hot with key on and the other goes to the rear.
I had the harness but the rubber plug that went on the switch was bad. I cut the plug off and installed a weather pack plug as that made contact with the switch.
It would not be hard to make up a harness from the rail to the switch.
Dave ----
OK, that confirmed my thoughts that it plugs in there on the transmission. I looked for an hour for cut wires but can't find them, Ill look again tonight. Any ideas on how to get a plug to attach them to if/when I find them that will plug into the tranny?
OK, that confirmed my thoughts that it plugs in there on the transmission. I looked for an hour for cut wires but can't find them, Ill look again tonight. Any ideas on how to get a plug to attach them to if/when I find them that will plug into the tranny?
Here is the switch, Duralast F401.
Here is the pigtail that plugs into the switch, It is called 614 pigtail at Autozone.
OK, that confirmed my thoughts that it plugs in there on the transmission. I looked for an hour for cut wires but can't find them, Ill look again tonight. Any ideas on how to get a plug to attach them to if/when I find them that will plug into the tranny?
The plug on the frame rail harness for the back up light harness should be around where the transmission crossmember is as the harness runs along the it to the switch.
It has to be in that area as all 80> trucks have back up lights.
Dave ----
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