GMC T-Series 2007 - Relay Center

Relay Center
There are four relay blocks in your vehicle:
A. Relay Block A
B. Relay Block B
C. Relay Block C
D. Relay Block D
(Not Shown)
Relay Block A Usage
1 Power Window (If Equipped)
2 Power Main (ECU)
3 High Beam
4 Lighting
5 Lighting (Low, High)
6 Trailer Turn Signal (Left Headlamp)
7 Taillamp
8 Marker Lamp (Tractor Only)
9 Trailer Turn Signal (Right Headlamp)
Relay Block A
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