Hi All- new to the forum and was hoping someone might be able to answer a question for me. I recently purchased a 2005 Sierra 2500HD to tow my boat. Like everything about it, but it needs towing mirrors. I found a nice set of used factory extendable tow mirrors for that year truck, but they are equipped with indicators in them as well as power extend. Does anyone know if all trucks have the wiring in them to utilize these functions (if they didn't come with the tow mirrors from the factory)? I would like these additional functions, and have no problem installing an additional switch for the power extend, but I don't want to have to cut and splice wires to make the indicators work. If anyone has any ideas let me know- thanks!