I don't have the color codes for the 3rd generation Dodge, but the 4 wires that come from the brake controller plug under the dash are:
2. -12VDC (ground)
3. brake light
4. trailer brake
The popular brake controllers will use either 3 or 4 of those wires. Controllers such as the Jordan Ultima 2020 don't use the brake light wire as it senses brake application via a control cable connected to the brake pedal arm.
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Rusty (oops - posted under my wife's login)
2000 - Texas Boomers Wagonmaster - 2016
2004 & 2008 iRV2 National Rally Wagonmaster
Texas and Boomers - we just naturally go together