The picture us of my 95 chevy 3500 2WD with a 6.5 TD and Auto Trans. My question to you all is. What is the connector to the right of the brake controller? I am unable to connect with a scan tool, and upon inspection I noticed this connector is connected to wires under the dash.

 

just to note I bought this truck used and it is apparent that at one time someone installed an alarm system and remote key FOB. I dont know if that has any bearing on what the connector is but any help would be great. thank you all.

 

Uninstall that junk before the thing autostarts and runs you over.