MSC03448 HB3/HB4 11 Pin Chevy GMC 1990-00 2003-06 Boss Headlight Adapter Kit

As of 5-5-2023, Boss has discontinued this harness due to low sales volume. Once our inventory is gone they will be hard to find.

Boss Headlight Adapter Kit MSC03448. This is only for the old style 11 pin harness. This is used by other brands too - old Snoway, Arctic...

For vehicles with HB3/HB4 Headlights. This is not used on the 1999-2002 New Body Chevy or GMC. 

This kit will work with halogen headlights 9005 and 9006. It is for a 1990-2000 classic body Chevy/GMC (make sure you have the HB3/HB4 lights, because they have other options in these vehicles) and a 2003-2006 new body GMC/Chevy. This is for the older 11 pin harness. If you have a 13 pin harness, you need adapter MSC04601.

*The newer style Boss harness is 13 pin and it uses an HB5 type adapter. The early harness was 11 pin and they use an adapter that was 2B style plug. These do not interchange, so make sure you are getting the correct adapter for your harness. The 11 pin is not that common anymore. 

The installation instruction can be find at this link.

To make sure this is what you need for your truck, check Boss' Power Match.

You can find a list of all the 11-Pin adapters at this link.

↓↓Click for the 11-Pin Adapter Chart↓↓