NHTSA ID Number: 10231096
Manufacturer Communication Number: IS-19910i
TSB/Document Date: 2023-02-04
Summary
ELECTRIC FAN DRIVE COOLING SYSTEM CONVERSION WITH DELCO REMY ALTERNATOR. REVISION : i Note added regarding power cable connection
secure the extra-length of cables together
close to the circuit breaker box as shown on
the image at right.
FIGURE 134
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111. Install the electrical connector cover #
050229.
Fasten with the following hardware:
4x bolt #5001697
4x lock washer #502570
112. Using good industrial glue (Loctite 404 or
similar product), glue three (3) pieces of
rubber extrusion #506025 as shown on the
connector cover.
FIGURE 135
FIGURE 136
113. Complete the installation of the sealing
elements. Screw the panels to the chassis
threaded holes where shown on the image.
Use the following hardware:
22x bolt #502848
FIGURE 137
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114. Complete the connection of the cables and
harness to the fan circuit breakers box (three
connectors: gray, black, red).
A: fan drive ground cable (black connector)
B: fan drive power cable (red connector)
C: “fan to RJB interface” harness (gray
connector)
NOTE
TRICK: Pre-twist the red and black cables counter-clockwise then insert the cables in their connector and lock. This will ensure that there’s
some pre-tension in the locking (clockwise) direction. This pre-tension will help the cables to
stays in place(locked position).
FIGURE 138
115. Secure the fan drive ground cable and the fan
drive power cable connected to the fan drive
circuit breakers box as shown on the pictures.
A: rivet #504379 (6x) (hole diameter: Ø 13/64)
B:tie mount #504013 (6x)
C:nylon tie #504016 (6x)
D: handcuff nylon tie #N37749 (1x)
FIGURE 139
FIGURE 140
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116. Connect the alternator control harness
connector C-ALT3 to connector C-ALT3 of
the “fan to RJB interface” harness. Secure the
extra length of harness as shown with nylon
ties.
A: handcuff nylon tie #N37749 (3x)
B:nylon tie #504016 (4x)
FIGURE 141
FIGURE 142
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INSTALLATION OF ELECTRIC COMPONENTS AND HARNESS
CONNECTIONS IN THE MAIN POWER COMPARTMENT
SCHEMATIC DIAGRAM OF ELECTRICAL CABLES & HARNESSES
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117. In the battery compartment, disconnect the
battery ground cable from the chassis ground
stud.
118. Most of the electric components will be
installed on the bulkhead at the right of
master relay R1 (when facing it). Identify the
master relay R1 on the image at right.
FIGURE 143
119. If the situation applies to the vehicle on which
you are working on, remove the two (2)
useless studs found on the bulkhead and then
sand to leave a smooth surface.
FIGURE 144
FIGURE 145
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120. Make sure this is no voltage at the master
relay R1 posts and then, remove the master
relay R1 cover.
FIGURE 146
121. Disconnect the four (4) cable lugs connected
to the master relay R1 upper post.
122. Momentarily, connect the elbowed lug of the
“master relay R1 to 300A fuse” cable
#23498450.
FIGURE 147
123. Find the best location where to install the fuse
holder #563750 on the bulkhead. Take note
that the fuse holder must be installed at the
distance that allows cable #23498450 to
reach it.
124. Drill two 11/64 pilot holes for the installation of
the fuse holder on the main power
compartment bulkhead. Secure with the
following hardware:
A: tapping screws #500658 (2x) + flat
washer #5001341 (2x)
FIGURE 148
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125. Reinstall the four (4) other cable lugs to the
master relay R1 upper post.
Being the largest lug at R1, the cable #23498450
lug should be placed first on the post (behind all
the other lugs) (or second if rubbing is likely to
happen).
Master relay R1- Port 30 – M10-1.5 stud nut
torque: 160-195 lb-in (18-22 Nm)
FIGURE 149: ON THIS PICTURE, CABLE #23498450 LUG IS
IN SECOND (2ND) POSITION BECAUSE IT WAS LIKELY TO
RUB ON THE HEAD OF ONE OF THE FOUR SCREWS.
126. Reinstall the master relay R1 cover.
FIGURE 150
127. Place the 300A fuse #564520 in the fuse
holder underneath the cable lugs.
128. Connect to the free post of the fuse holder the
two (2) following cables that are routed from
the alternator and the fan drive circuit
breakers box:
•
•
Fan drive power cable #23498721
L.H. alternator power cable #23524934
A: nut #5001983 (2x)
B: washer #5001341 (2x)
Thread the nuts and tighten to a torque of 96
lbf-in (11Nm).
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FIGURE 151: TAKE NOTE THAT THE 300A FUSE IS NOT
PRESENT ON THE PICTURE ABOVE BUT IT SHOULD BE
INSTALLED AT THIS STEP
IS-19910H
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129. Secure the “fan drive power” cable and the
“L.H. alternator power” cable as shown on the
pictures at right using the following parts:
A: tie mount #509490 (2x)
B: rivet #504610 (2x) (hole diameter: Ø 17/64)
C:nylon tie #509491 (3x)
FIGURE 152
FIGURE 153
130. Install the MCM #23499009-EFD and the I/OB module #22722850 on the bulkhead.
•
•
Spacing between the I/O-B and the MCM=1
inch
Pilot holes diameter: 11/64”
Install with the following hardware:
Tapping screws #500658,
3x for the MCM
4x for the I/O-B module
FIGURE 154: MAIN POWER COMPARTMENT
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131. Depending on the coach configuration, an
existing mounting plate may extend where the
MCM should be installed and cause
interference. If this mounting plate useless,
cut it off along the red line shown on the
image.
IMPORTANT: Do not leave a sharp edge.
Smooth down the edge.
FIGURE 155
132. In the main power compartment, connect the
“fan to RJB interface harness” to the “MCM to
I/O-B interface harness” #23445869 by
means of connector C-EFD1.
133. Connect the MCM and the I/O-B module
together using the “MCM to I/O-B interface
harness” #23445869.
134. Connect the OEL resistors connector RES1F
and RES2F (part #563593) to the “MCM to
I/O-B interface harness”. See the image at
right and the following pictures for reference.
FIGURE 156
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FIGURE 157
A:nylon tie #504016 (3x)
FIGURE 158
A:nylon tie #504016 (2x)
FIGURE 159
A:nylon tie #504016 (3x)
B:nylon tie #509491 (2x)
C:swivel mount #504751 (1x)
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FIGURE 160
B:nylon tie #509491 (2x)
C:swivel mount #504751 (1x)
IS-19910H
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135. In the main power compartment, connect the
“vehicle interface harness” #23490553 to
the “MCM to I/O-B interface harness” by
means of connector C-EFD2.
FIGURE 161
136. Connect circuit 24VI, 24VD & GND2 to post
1, 2 & 5 respectively of the junction block.
FIGURE 162
137. Get the J1939 signal. To do so, locate
connector C193 among the existing
harnesses in the main power compartment.
138. Disconnect connector C193 and connect with
C193FS and C193FP of the “vehicle
interface harness” #23490553.
FIGURE 163
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139. In the main power compartment, locate I/O-B
module A52 (alternately named AE52).
140. At A52 (or AE52), remove existing circuit 291
and 292 from connector J1:1 (pin 1) and J1:2
(pin 2).
141. For each circuit, cut the terminal and put a
heat shrinking sleeve at the end of the wire.
Those circuits won’t be used anymore.
142. Insert circuit 291 and 292 of the “vehicle
interface
harness”
#23490553
into
connector J1 pin 1 and J1 pin 2 respectively.
FIGURE 164
143. Install the U-shaped telltale light module
bracket #381594 at an appropriate place in
the electrical compartment where it can be
reached by the “fan to RJB interface”
harness.
Fasten to the bulkhead using two (2) rivets
#504379 (hole diameter: Ø 13/64).
144. Install two tab terminals #561540 on the 24V
red telltale light module (#830165) wires.
145. Install the telltale light module in the telltale
module bracket #381594. Using a P-Touch,
make a label indicating “LH ALT”.
146. Connect the appropriate branch of the “fan to
RJB interface harness” to the telltale light
module.
FIGURE 165
FIGURE 166
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147. There are remaining nylon ties and tie mounts
in the kit. Use them to secure the harnesses
and cables that may seem loose. The goal is
to prevent rubbing of the cables and
harnesses.
FIGURE 167
148. Install one (1) warning decal #069205 as
shown on the image.
FIGURE 168
149. Install a second warning decal #069205 as
shown on the radiator door.
FIGURE 169
150. Fasten the
assembly.
door
upper
arm
FIGURE 170
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151. Refill the cooling system. Connect coolant
extractor. Use coolant extractor to refill the
coolant from the engine.
FIGURE 171
152. Reinstall the rear bumper.
FIGURE 172
153. Reinstall the access panel located behind
tag axle L.H. side wheel.
FIGURE 173
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154. Reinstall L.H. side rear fender.
FIGURE 174
155. In the battery compartment, connect the
battery ground cable to the chassis ground
stud.
FIGURE 175
156. In the main power compartment, set the
battery master switch to the ON position.
157. Set the ignition switch to the ON position.
158. In the main power compartment, reset the
circuit breakers and wait two (2) minutes for
the new installer I/O-B module to be
programed.
IMPORTANT NOTE
VEHICLES EQUIPPED WITH OPTIONAL PRIME ENERGY MANAGEMENT SYSTEM
TO PREVENT OVERLOADING THE L.H. SIDE ALTERNATOR, IT IS VERY IMPORTANT TO
DISABLE « PRIME » SYSTEM ON VEHICLES RECEIVING THIS CONVERSION. PLEASE
CONTACT YOUR NEAREST PREVOST
SERVICE CENTER TO HAVE THE PRIME SYSTEM
DISABLED. A SOFTWARE TOOL IS NEEDED TO DO SO.
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SYSTEM TEST
159. Start the engine to idle.
160. With the engine in idle (600 rpm), use the
Diagnostics menu of the Driver Information Display
to engage the fans in speed 1.
Diagnostics > Vehicle Tests > Activate Radiator FAN Speed 1
The height (8) fans should run at 50% of the maximum
speed. You need to evaluate the sound level and the power
of the air stream to determine the speed.
161. Engage the fans in speed 2.
Diagnostics > Vehicle Tests > Activate Radiator FAN Speed 2
The eight (8) fans should run at 75% of the maximum
speed.
162. Set the engine to the fast idle, the fans should then
engage at 100% of the maximum speed.
163. If the fans behave in accordance with the criterions
of the previous steps, then they operate normally.
PARTS / WASTE DISPOSAL
Discard waste according to applicable environmental regulations (Municipal/State[Prov.]/
Federal)
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TSB/Document ID: IS-19910i
Replacement Service Bulletin Number:
MFR Communication Date: 2023-01-17
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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