GMC T-Series 1999 Owner's Manual page 256

Number Circuits Protected
10 Checker Connector (TICS)
11 Trailer Turn (LH) Lamp, ID Lamp,
Marker Lamp, Clearance Lamp
12 Auxiliary (Ignition ON)
13 Auxiliary (Battery Direct)
14 Headlamp (LH)
15 Headlamp (RH)
16 Headlamp
17 Engine Stop Actuator
18 M.F.A.M., Hydraulic Brake Motor
19 Taillamp, Light MIR, Illumination Lamp
20 Cool Condenser Fan Motor,
Cooler Compressor
21 Wiper Motor, Washer Motor
22 Heated Mirror, 2
-
2 Speed Axle Relay
23 Hydraulic Brake Relay, M.F.A.M.,
Flasher Unit
24 Blower Motor, Air Conditioner Relay
25 Trailer Turn (RH) Lamp, Flasher Unit
26 Power Post (Consent)
6-70
-
Speed Axle Motor,
-
Maxi Fuse Block
When a circuit goes out, first check the instrument panel
circuit breaker block. If no circuit breakers are out there,
the problem could be in the maxi
-
This block uses blade type fuses. It is located outside of
the cab at the rear, on the driver's side.
-
To access the maxi fuse block, remove the four screws
from the front of the box and remove the cover.
yellowblue
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fuse block.