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MBS-1P Installation
Circuit Requirements
The solenoid valves used in the Wabash MBS products allow higher airflow
and require less voltage and current than most trailer ABS systems. For a
nominal 12-volt supply, current consumption is about 1.25 amperes maximum
during ABS activity. Satisfactory operation is available down to 7 volts.
The MBS-1P minimizes trailer issues caused by inadequate voltage (typically
found in 3-trailer units).
Malfunction Lamp Diagnostic Switch
NOTE: The malfunction lamp bulb must be incandescent. Always replace
the bulb with another incandescent bulb of the same value.
A diagnostic switch is located near the ABS malfunction lamp. A malfunction
lamp harness incorporating this switch is included in the MBS-1P kit.
NOTE: While this feature is desirable, it is not essential. Diagnostic flash
codes can also be activated from the tractor cab via the ignition switch.
Power
Cable
Connector
Malfunction
Lamp Pigtail
Figure 10, ABS Malfunction Lamp Installation
16
Malfunction Lamp
Mounting Bracket
Malfunction Lamp
Ground Wire
Malfunction Lamp
Diagnostic Switch
Malfunction Lamp
Power Wire
Trailer Wall
P U
T
IN
C H
SE
S)
S
IT
ES
U LT
S W
N
PR
FA
EE
T
T IC
TW
R R
EN
R
O S
ND
BE
C U
M ES
FO
G N
CO
D
TI
S
SE
R EA
O
ES
D IA
ON
E
S TW
PR
N D
S)
U LT
OW
TO
2N
D
C O
FA
LL
ES
(A
PR
O LD
SE
O R
ED
M ES
R
2
(H
R EE
TI
FO
X
TH
D
R EE
ST
S
R EA
ES
U LT
S
S TH
D
PR
N D
S)
TO
ES
3R
C O
FA
PR
ED
O LD
SE
O R
M ES
R
3
(H
R EE
ST
FO
X
TH
A R
U R
TI
S
C LE
ES
S)
S
FO
H
PR
N D
TO
ES
4T
C O
PR
O LD
SE
4
(H
R EE
X
TH
T E
N O
®
P
- 1
EM
SY
L
ST
S
E
NA
E
2
BR
NA
AK
TIO
TI
BL
97
B
CK
SH
PA
00
LO
WA
BA
M
N #2
50
M
AN
TI-
OF
T
S
CO
R
U CK
UC
: W
AI
LE
PR
OD
M B
ER
TR
4
A
TR
C-
N U
PL
R T
PA
A L
D EC
Malfunction Lamp
(Must be incandescent)
®
N C
E
R E
F E
S)
R E
EM
K
ST
IC
SY
Q U
AL
OR
M ES
GN
NS
S)
D E
E TI
SI
4 SE
EM
C O
OR
ON
ON
ST
H
RE
NS
DE
TI
SY
A S
H
TH
SE
SI
EC
OR
F L
AS
SI
DE
RB
M ES
4 SE
NN
NS
S)
FL
RB
CU
CO
EM
CU
NT
TI
OR
ON
ST
(F
RO
FO
UR
SE
NS
DE
SY
X
3
H
SI
AL
OR
AS
SI
DE
RB
4 SE
GN
NS
S
FL
RB
CU
M ES
SI
EM
CU
NT
TI
OR
ON
ON
ST
4
(F
RO
FI
VE
SE
NS
DE
TI
SY
X
H
DE
SI
EC
OR
AS
SI
AD
4 SE
NN
NS
FL
AD
RO
M ES
CO
RO
RO
NT
X TI
OR
ON
5
(F
SI
SE
NS
DE
AL
X
H
DE
SI
GN
AS
SI
RO
AD
SI
ON
FL
AD
M ES
OR
TI
RO
RO
NT
TI
NS
NN
EC
6
(F
N
SE
CO
X
SE
VE
AR
H
RE
M ES
NS
OR
AL
AS
SI
DE
T TI
SE
GN
FL
RB
AR
SI
ON
CU
EI
GH
RE
OR
TI
H
DE
M ES
NS
EC
X
7
FL
AS
SI
TI
SE
NN
RB
NE
AR
CO
CU
H
NI
RE
OR
8
AS
DE
M ES
NS
X
FL
AD
SI
TI
SE
RO
N
AR
H
TE
RE
9
AS
SI
DE
M ES
UL
T
X
FL
AD
TI
FA
RO
EN
M
EV
Y
PC
M ES
X
10
H
EL
AR
T
AS
ND
TI
UL
FL
CO
EL
VE
FA
M ES
SE
TW
M
TI
H
Y
PC
EN
S
E
X
11
FL
AS
AR
TE
AB
UL
IM
UR
E TO
M OD
PR
H
FO
AG
M ES
L
12
AS
LT
N
TI
RO
X
FL
W
VO
EE
NT
LO
FT
CO
H
FI
IC
14
AS
TR
ON
X
FL
EC
EL
X
15
MBS-1P
Flash Code
Decal
322UX026
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