Lull 944E-42 Service Manual - Manual (Page 621)

9.111 Model 644E-42/944E-42 Rev. 6/04
Electrical System
Replace closed cab harness.
Not
OK
Blower motor inoperative at
any speed.
Check for voltage to wire
[BLB] (YEL/GRN) to
blower switch.
Check voltage at wires
[BLL] (YEL), [BLM] (RED)
and [BLH] (ORG) on 7 pin
blower connector. Check
wire [EVG] (BLK) for
proper ground.
Replace blower motor.
Check output voltage from
blower switch on wires
[BLL] (YEL) (L),
[BLM] (RED) (M) and
[BLH] (ORG) (H).
Replace switch.
If
OK
If OK
If OK
Not
OK
Before troubleshooting any
electrical circuit, ALWAYS
begin by checking the
following:
1. Fuses.
2. All connections relating to
circuit are clean and tight.
3. All grounding straps are
intact and securely
fastened, refer to Section
9.1.12, “General Overview
(Vehicle Ground Strap
Locations).”