Webasto Thermo Top C Installation Instructions Manual - page 6
6
Thermo Top C
2 Electrical Overview
ATTENTION
Ensure wiring and wiring harnesses are securely fastened to the vehicle. If not described differently, securing of
wiring is done with cable ties to the vehicle’s own wiring harnesses.
2.1 Universal Electrical Harness Description
Legend for Figure 1
Fig. 1
1
2 3
4
5
6
7
8
10
11
9
12
13
14
15
16
17
19
18
20
21
22
23
24
25
26
1 Fuse holder and fuses
2 Resistor - HVAC blower control
3 Relay K1 - HVAC control
4 Relay K2 - HVAC control
5 18 GA green - “ON” signal from relay K1 and K2 to
relay K3, pin 86
6 18 GA blue - Ignition “ON” signal source
7 Main heater harness
8 Blower control harness - Positive side
9 10 GA black - HVAC control switch circuit, splice to
blower motor positive circuit (motor side)
10 10 GA red - HVAC control switch circuit, splice to
blower motor positive circuit (control side)
11 18 GA green - “ON” signal from relay K1 and K2 to
relay K3, pin 86, use when relay K3 is mounted near
HVAC blower motor (same circuit as item 5)
12 Blower control harness - Negative side
Harness is wire tied to main harness for shipping
purposes only, cut wire tie to separate negative
side blower harness from main harness
13 10 GA white - HVAC control switch circuit,
splice to blower motor negative circuit (motor
side)
14 10 GA blue - HVAC control switch circuit, splice
to blower motor negative circuit (control side)
15 10 GA brown - Connect to vehicle ground point
when relay K3 is mounted near HVAC blower motor
16 18 GA green - Relay K3, pin 86 (connects to “ON”
signal 18 GA green from relay K1 and K2). See items
5 and 11.
17 Relay K3 - HVAC control (typically mounted near
HVAC blower motor)
18 18 GA blue and brown - Fuel metering pump
harness
19 20 GA black, red and brown - Timer harness
20 18 GA violet - “Vent Mode” for optional remote
control
21 10 GA red - Battery positive
22 10 GA brown - Battery negative or ground point
23 Main power harness
24 18 GA yellow - Diagnostic connection
25 18 GA orange - Supplemental heating option
26 10 GA brown - Optional ground connection for relay
K3 when K3 is mounted with relay K1 and K2