NHTSA ID Number: 11028617
Manufacturer Communication Number: M1508
TSB/Document Date: 2026-02-06
Summary
SERVICE BULLETIN M1508 (REV C): 2009-2025 TRIKE PLATFORM - REVERSE MOTOR. PURPOSE: Revision C. To inform dealers of a running change for the new reverse motor (Part No. 83388-09C) for Trike models. As of January 28, 2020 all Trike platform vehicles will be manufactured using the new reverse motor. The new reverse motor will be used to replace reverse motor assemblies (Part No. 83388-09, 83388-09A,83388-09B) that have failed diagnostics. Refer to Table 3. This motor contains several improvements for better motor durability. A new procedure has been added, Refer to PINION EXTENDS BUT REVERSE MOTOR STALLS OR SPINS SLOWLY. REV C: Update Removal and Assembly (R&I) of the Solenoid. Updated: DISASSEMBLE, ASSEMBLE and Install Electrical Kit.
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TSB/Document ID: M1508
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-30
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL/PROPULSION SYSTEM
MFR Component System:
MFR Component Subsystem:
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A1
(+)
[78-3]
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(–)
Figure 33.
a. Yes. Go to Step 20.
Figure 35.
b. No. Replace Body Control Module (BCM).
a. Yes. Go to Step 22.
b. No. Replace ECM.
20. Reverse Enable Feedback Test
1.
Turn IGN OFF.
22. Reverse Activate Input Open Test
2.
Remove Body Control Module (BCM) BOB, and connect
[242].
1.
Turn IGN OFF.
3.
Connect BREAKOUT BOX (PART NUMBER: HD-50390-1)
and ECM CABLE (PART NUMBER: HD-50390-4) between
wire harness [78B-1], [78B-2], [78B-3] and ECM [78A-1],
[78A-2], [78A-3].
2.
Disconnect RCM [245] and inspect connections.
3.
Test resistance between BOB [78-3] terminal 16 and [245B]
terminal 4.
4.
Verify ECM OVERLAY (PART NUMBER: HD-50390-4-P)
is in position on BOB.
5.
Start engine.
M1508
15 / 23
4.
Is resistance less than 0.5 Ω?
2.
Did the trike reverse but the pinion stuck when the button
was released?
1205671
a. Yes. Go to Step 2.
HD-50390-1
Modular Break Out Box
ECM
b. No. System functioning properly.
HD-50390-4-P
[78-1]
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[78-2]
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[78-3]
(+)
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8
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(–)
2. Electrical Kit Test
1.
Connect a voltmeter to [T12] and [T7] on the reverse motor.
2.
Press the reverse button while watching the voltmeter.
3.
Release the reverse button while watching the voltmeter.
4.
Was battery voltage momentary seen on the voltmeter
when the switch was released?
14
1423216
Figure 36.
R
BK
a. Yes. Replace RCM.
b. No. Repair open in (TN) wire.
23. Reverse Motor Test
1.
Start engine.
2.
With reverse button pressed, test voltage between reverse
motor terminal [T7] and [T12].
3.
BK
R
R
Is voltage greater than 10 V?
BK
1422361
R
BK
Figure 38.
a. Yes. Replace the solenoid.
b. No. Replace electrical kit.
DISASSEMBLE
BK
R
BK
R
NOTE
Before disassembling reverse motor, see REVERSE MOTOR
TESTING.
See Figure 39. DO NOT remove lower screw (1) securing
solenoid when servicing or replacing electrical kit.
Figure 37.
a. Yes. Replace reverse motor.
b. No. Replace electrical kit.
REVERSE MOTOR PINION WILL NOT
DISENGAGE
1. Validation Test
1.
Press down the reverse button.
16 / 23
M1508
2069583
1
10.
NOTE
See Figure 48. Lower screw securing solenoid does not
need to be removed unless removing solenoid.
See Figure 49. Remove reversing switch bracket.
a.
Remove screw (1).
b.
Verify O-ring (4) behind upper bracket (3) remained
in place.
c.
See Figure 50. Remove bracket screw (13).
11. See Figure 50. Remove timing relay.
1.
Lower screw
Figure 39. Lower Screw Location
Remove Electrical Kit
1.
Remove reverse motor. See service manual.
2.
Observe location of cable straps.
3.
Discard cable straps securing wiring.
4.
See Figure 51. Remove Contactor Z.
a.
Disconnect four-way connector (6).
b.
Remove timing relay screws (14).
Remove Solenoid
1.
If necessary: Remove contactor Z lower screw (4).
2.
Remove solenoid, disengaging plunger from lever.
ASSEMBLE
6.
Unintended continuous rearward movement of motorcycle
can occur if the reverse button is depressed and the spring
is misaligned during installation in the solenoid/plunger
assembly, which could result in death or serious injury.
Follow assembly instructions closely to ensure proper
function. (19504a)
a.
Remove mounting screws (1) while holding nuts (6).
b.
Note wire orientation.
c.
Remove terminal screws (5) securing wire #11 (4)
and wire #1 (3) from Contactor Z.
Install Solenoid
Remove Contactor Z (7).
1.
See Figure 46. Install plunger (2) with slot on arm (1).
2.
Install O-ring (4).
3.
See Figure 45. Assemble solenoid.
d.
5.
WARNING
See Figure 50. Disconnect wires from reversing switch to
solenoid.
a.
Remove wire #8 (8) nut from solenoid (3).
b.
Remove wire #5 (5) nut from solenoid.
a.
See Figure 40. Install spring (1) into solenoid body
(2).
Disconnect wires at reverse motor.
a.
Retract rubber boots from terminals on reverse motor.
b.
Remove wire #7 (7) nut from reverse motor (10).
c.
Remove wire #12 (12) nut from reverse motor.
7.
Remove wire #2 (2) nut from solenoid.
8.
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