Where Does White Wire Attach for the Demco Coachlink Transmitter

Updated 10/27/2025 | Published 03/15/2025

Question:

I have the demco wireless transmitter. The red wire is attached to the one of the wires coming out of the transmitter. The other wire is missing. Which wire coming out of the transmitter should I connect a replacement wire to? Thanks

asked by: Scott

Expert Reply:

Hey Scott, thanks for reaching out!

The Demco Wireless Coachlink Braking Monitor # SM99945 transmitter only has the 2 wires; a white one, and a red one (see attached photo). Since your red wire is fine, you'll be adding your replacement wire in place of the white one.

I'm not sure what braking system you have, but I'm attaching wiring diagrams for both the Air Force One and the Stay-IN-Play DUO for your reference.

Hopefully this answers all of your questions! Let me know if anything else pops up!

expert reply by: Jon G

How to Wire up Coachlink Transmitter
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2 Wires From Coachlink Transmitter
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How to Wire up Coachlink Transmitter
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Jon G.

10/27/2025

Hey Scott, how did things go after you replaced the missing white wire on your Demco Wireless Coachlink transmitter? Your update could make it easier for others working through the same wiring issue.