Here's why and where you should look:
* Factory Variation: Dodge likely offered different wiring schemes depending on the options package (towing package, etc.) of your truck.
* Aftermarket Modifications: Previous owners might have rewired the connector for various reasons.
* No Central Database: There isn't a database that lists every possible wiring configuration for every vehicle.
Where to Find the Information:
1. Your Owner's Manual: This is your first stop. While it might not explicitly show a pinout diagram for the 6-pin connector, it *might* have a general section on towing and wiring.
2. Wiring Diagram: Your best bet is to locate a wiring diagram specific to your 1999 Dodge Ram 2500's year, model, and trim level. You can try these sources:
* Online Automotive Repair Manuals: Sites like AllDataDIY or Mitchell 1 (subscription required) offer detailed wiring diagrams.
* Repair Manuals (physical): A Haynes or Chilton manual for your vehicle could contain the wiring information.
* Dodge Dealership: A Dodge dealership might have access to the original wiring schematics. This is your last resort, as they may charge a fee for this information.
3. Test the Wiring: If you have a multimeter, you can test the wires at the 6-pin connector to determine their function. This is time-consuming but reliable. Refer to a standard 6-pin trailer wiring diagram to see which pins correspond to running lights, turn signals, brake lights, etc. Proceed cautiously as you could cause a short.
4. Trailer Wiring Adapter: Some adapters come with a schematic printed on them. If you purchased the adapter, check there. If you can't find the original adapter, perhaps the same type is for sale somewhere else.
Important Safety Note: Incorrect wiring can lead to malfunctioning lights or even short circuits. If you are unsure, it's best to have a qualified mechanic check the wiring before towing.
