skyvalley
New Member
I hope someone can help me, I'm going crazy 
I have a 2000 Expy and it has the light duty trailer option (the 4 pin flat). I'm trying to convert it to 7 pin with a brake controller. It has a connector under the dash for the brake controller and the harness the 4 pin plugs into has 7 wires (from the truck). I got the hd tow pkg harness p/n YL3Z-13A576-GB, but it has 2 connectors to plug into the truck, the 4 pin only had one. Does anyone know where the other plug goes into? Thanks in advance!

I have a 2000 Expy and it has the light duty trailer option (the 4 pin flat). I'm trying to convert it to 7 pin with a brake controller. It has a connector under the dash for the brake controller and the harness the 4 pin plugs into has 7 wires (from the truck). I got the hd tow pkg harness p/n YL3Z-13A576-GB, but it has 2 connectors to plug into the truck, the 4 pin only had one. Does anyone know where the other plug goes into? Thanks in advance!

