High/Low range lights--manual shift
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
The tranny doesn't have to know whether it's in 4WD or not. It only needs to know whether it's in low range. So a simple SPST switch, similar to a reverse light switch on a manual transmission, suffices. So one of those wires probably comes from a 12V power source, and when you ground it, it'll probably blow that fuse.
Fleet Mechanic
Joined: Jan 2011
Posts: 1,709
Likes: 4
From: 8600 ft in Colo
The tranny doesn't care about 4x4, but the switch on the TC still needs to turn on the indicator light. 12v goes to one side of each indicator light, and the other side of each light is connected to one of the two wires on the TC switch. The switch grounds each of the wires as needed, completing the circuit. The PCM connects to the low range wire between the light and the switch.
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Senior User
Joined: Sep 2003
Posts: 467
Likes: 0
From: Manton,MI
You were right just two ground wires. One turns on the 4x4 light and the other turns on the Low Range light. Being that it sometimes works I oiled the crap out of the switch put it back in and it works like a charm. It also shifts correctly in low range.
Thanks for all the help. RB
Thanks for all the help. RB
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Senior User
Joined: Sep 2003
Posts: 467
Likes: 0
From: Manton,MI
You were right just two ground wires. One turns on the 4x4 light and the other turns on the Low Range light. Being that it sometimes works I oiled the crap out of the switch put it back in and it works like a charm. It also shifts correctly in low range.
Thanks for all the help. RB
Thanks for all the help. RB
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