Hummer H1 Service Manual page 792

______________________________________________________
®
MAJOR POWER DISTRIBUTION
The following charts and illustrations convey how power is
distributed from the vehicle batteries to the fuse/relay centers.
Power is supplied to the fuse boxes from the batteries through
fusible links. Each fuse box has internal power busses that di-
rect the power to the fuses. The busses are indicated on the fuse
charts as follows: I = Ignition, B = Battery, A = Accessory, L
= Lamps.
The fuse charts contain a listing of the cavities in the fuse box,
the corresponding circuits, wire colors and gauges (ga.).
G4
G3
G1
ENGINE
05745159
INTERIOR
GROUND BUSS
EXTERIOR FUSE BOX
GROUND BUSS
ALTERNATOR
M
FUSIBLE
LINK
STARTER
GLOWPLUG
CONTROLLER
Figure 12-35: Major Power And Ground Schematic
Electrical System
Power is supplied to an individual fuse by the buss indicated in
the left buss column. The circuit number (CKT No.) contains
two entries for a fuse: the power supply buss and the outgoing
circuit number. The numbers in the cavity column relate to
the cavities indicated on the fuse/relay cavity I.D. illustrations.
Using this information, you can determine which cavity of a
fuse is the power supply cavity and which other fuses are sup-
plied by the same buss.
INTERIOR
FUSE BOX
FUSIBLE
LINK
FUSIBLE
LINK
EXTERIOR
FUSE BOX
BATTERY
12-21
FUSIBLE
LINKS
EXTERIOR
POWER
BUSS
FUSIBLE
LINK
BATTERY
9-S12-088
4-1-00