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SoFLAlpine · 11-27-2022, 07:54 AM

Hi All,
I have a 2003 38' alpine that has the original ac units with the 5 button thermostat. I removed the rear ac unit to reseal the unit and the phone line that controls the unit from thermostat has the wires crimped where you can see the wire colors. Turns out these wires are very fragile and some of the wires broke off at the crimp. The only wires still connected were a yellow to black wire. i found 3 crimp connectors so idk if all 4 wires were connected or if all four are needed. I wish i would of taken a picture of them but i didn't. I looked at the phone line going to front unit and the wire colors match. So the back unit is wired differently than the front unit. I was wondering if anyone has experience with these wires or could possibly look at theirs and let me know the correct wiring..carefully. They can be accessed under the filter cover. Thanks!!

YC1 · 11-28-2022, 09:30 AM

Here is a file that might help. It does not show colors of course because electrons are color blind.

You may have to find the other end to identify the pinout.

A picture might help as well to be sure.

Jeep401 · 11-28-2022, 02:19 PM

I had to replace that wire in mine from the front to the back. I can't help with the "do you need" part, but the ends are readily available at home improvement box stores.
Make sure and get the wires in the proper order, it's not the same as a phone.

Jeep401 · 11-28-2022, 02:22 PM

Quote:

Originally Posted by YC1

Here is a file that might help. It does not show colors of course because electrons are color blind.

You may have to find the other end to identify the pinout.

A picture might help as well to be sure.

Looks like page 3 shows the colors and order.

SoFLAlpine · 11-28-2022, 06:59 PM

Thanks for the link YC1. I may have the wiring correct but when i have time to dig into it i'm going to check it out. The line going to rear unit is pretty long so it will be easy to do a continuity test on the wires. It appears the phone line from the thermostat goes to the front unit and the rear is fed from the front unit.

YC1 · 11-29-2022, 05:09 AM

Good eyes Jeep, guess I got lazy.

sandy1 · 12-02-2022, 10:07 PM

The phone line goes to control box on front a/c second line on front a/c goes to
Rear a/c. On some there is a second line off rear a/c for control of hydrohot if installed

SoFLAlpine · 12-04-2022, 07:01 PM

So the line going to the back unit plugs into a connector that has 2 female plugs on each end. The mail plug coming from the control board on the Ac plugs into 1 side. The other side the cable from the front unit plugs into it. It appears that this connector reverses the color code. The cable coming from the front has the 4 wires stripped and crimped BUT they were so fragile the wires broke off at the crimps except for the yellow to black wire. The front unit where the wires are crimped the colors are not swapped. I just got back today and i plan on checking it out further this week. Luckily the front unit was sufficient.