TECHNICAL SERVICE BULLETIN

LP SOLENOID POWER SOURCE RELOCATION

TSB:

26-003: M920029

Date:

5/13/2026

Product:
Repair Time:

Lineage M-Series 25FW
0.5h

Purpose
This bulletin describes the procedure to relocate the LP solenoid power source from the chassis battery
to the house battery on Lineage M-Series 25FW units equipped with an LP solenoid. The relocation uses
retrofit harness EL-0189.
NOTE: Actual color and finish of components may differ from those depicted in this document.

Safety
This document provides general instructions. Many variables can change the circumstances of any procedure,
including the degree of difficulty involved in the service operation and the ability level of the individual performing
the operation. In the event the skill level required is too advanced or the procedure too difficult, a certified
technician should be consulted before performing the operation. Failure to correctly install, remove, or service the
system may result in voiding the warranty, inflicting injury, or even death.

WARNING

The "WARNING" symbol indicates a procedure has a safety risk involved and may cause
death, serious personal injury, or severe product and/or property damage if not
performed safely and within the parameters set forth in this document.

WARNING

ELECTRICAL HAZARD. Disconnect the chassis battery and turn all house battery breakers
OFF before opening the DCD panel or working on any 12 V circuits. Working on energized
circuits can cause arc-flash, burns, or component damage.

CAUTION

The "CAUTION" symbol indicates a procedure has a safety risk involved and may cause
personal injury or product and/or property damage if not performed safely and within
the parameters set forth in this document.

CAUTION

TORQUE SPECIFICATION. The AUX breaker ring terminal screw must be torqued to 15 inlbs. Over-torquing can damage the breaker terminal; under-torquing can cause loose
connection, arcing, or intermittent operation.

CAUTION

WIRE ROUTING AND RETENTION. After the harness is installed, all wires must be properly
secured so they cannot fall, chafe, or shift during transit. Unsecured wiring can cause
insulation damage, short circuits, or LP system failure.

Rev: [06.26.2026}

Page 1 of 7

PCN 27-51039 / TSB

TECHNICAL SERVICE BULLETIN

LP SOLENOID POWER SOURCE RELOCATION

TSB:

26-003: M920029

Date:

5/13/2026

Product:
Repair Time:

Lineage M-Series 25FW
0.5h

Affected Units
This procedure applies to Lineage M-Series 25FW units that ship with an LP solenoid powered from the chassis
battery. Confirm unit eligibility by checking the build date or by verifying that the LP solenoid power feed is present
at the 5A fuse holder inside the driver's seat (see Fig. 1).
Affected model: Lineage M-Series 25FW with LP solenoid
Affected serial range: MM2613TFF01108 through MM2613TFF01359
Affected build dates: 10/21/2025 – 4/7/2026

Resources Required
The following tools are required to complete this procedure:
•
•
•
•
•
•
•
•

Wire cutters
Wire strippers
Crimping tool (for butt connectors)
Heat gun (for heat-shrink butt connectors, if used)
Torque screwdriver, capable of 15 in-lbs
Phillips screwdriver
Wire ties
Wire end caps (for capping abandoned harness wires)

Required Components
Callout

Part #

Qty

Description

A

Call GDRV Parts

1

Retrofit harness, LP solenoid power relocation

B

Shop Supply

2

Butt connectors (for splicing harness to LP switch wires)

C

Shop Supply

AR

Wire end caps (AR = as required to cap abandoned 5A fuse
holder wires)

D

Shop Supply

AR

Wire ties (AR = as required for harness retention)
*Part images not to scale relative to each other.

Rev: [06.26.2026}

Page 2 of 7

PCN 27-51039 / TSB

TECHNICAL SERVICE BULLETIN

LP SOLENOID POWER SOURCE RELOCATION

TSB:

26-003: M920029

Date:

5/13/2026

Product:
Repair Time:

Lineage M-Series 25FW
0.5h

Preparation
Step 1 — Position the unit on a level surface and chock the wheels.
Step 2 — Disconnect the chassis battery and turn all house battery breakers OFF before beginning
work.

Instructions — Remove Existing Chassis Battery Feed
Step 1 — At the driver's seat, locate the existing 5A fuse and fuse holder for the LP solenoid, located
just inside the driver's seat base.
Step 2 — Pull the fuse holder out from beneath the driver's seat as far as possible to gain working
access.
Step 3 — Cut the fuse holder wires just behind the fuse holder.
Note: Cut close enough to the fuse holder that adequate wire length remains in the harness to cap and secure
the abandoned ends.

Fig. 1-3 — Location of the 5A fuse

Step 4 — Discard the fuse holder.
Step 5 — Cap the wires that remain in the harness using approved wire end caps.

Rev: [06.26.2026}

Page 3 of 7

PCN 27-51039 / TSB

TECHNICAL SERVICE BULLETIN

LP SOLENOID POWER SOURCE RELOCATION

TSB:

26-003: M920029

Date:

5/13/2026

Product:
Repair Time:

Lineage M-Series 25FW
0.5h

Note: Both abandoned wires must be individually capped and secured. Do not leave any conductor exposed.

Fig. 4-6 — Cap off both wires separately and discard the fuse.

Instructions — Splice New Harness at LP Switch
Step 1 — Remove the LP shut-off switch from its panel.
Step 2 — Pull the existing wire and route the new EL-0189 harness out through the switch hole.
Step 3 — Locate the light blue wire on the existing switch harness. Cut this wire several inches after the
QD (quick-disconnect) female connector.
Step 4 — Butt-connect the two leads of the new EL-0189 harness to the two cut ends of the light blue
wire.
Note: Connector orientation does not matter for this splice.

Step 5 — Re-install the LP shut-off switch in the switch hole. Secure all wires so they cannot fall or shift
during transit.

Rev: [06.26.2026}

Page 4 of 7

PCN 27-51039 / TSB

TECHNICAL SERVICE BULLETIN

LP SOLENOID POWER SOURCE RELOCATION

TSB:

26-003: M920029

Date:

5/13/2026

Product:
Repair Time:

Lineage M-Series 25FW
0.5h

Fig. 3 — LP shut-off switch removed from access panel.
Fig. 4 — Pull existing wire and the new harness through the switch hole.
Fig. 5 — Butt-connect splice between EL-0189 harness and the cut light blue wire.

Instructions — Route Harness to DCD and Connect
Step 1 — Remove the entry step cover to access the under-step compartment.

Fig. 6 — Entry step cover removed for access to the DCD panel.

Rev: [06.26.2026}

Page 5 of 7

PCN 27-51039 / TSB

TECHNICAL SERVICE BULLETIN

LP SOLENOID POWER SOURCE RELOCATION

TSB:

26-003: M920029

Date:

5/13/2026

Product:
Repair Time:

Lineage M-Series 25FW
0.5h

Step 2 — Confirm that the chassis battery is disconnected and all house battery breakers are OFF, then
remove the DCD panel screws to gain access behind the panel.
Step 3 — Route the new harness down the passenger side of the frame and into the step box, passing
through the spare rubber grommet in the side of the step box.
Note: Use the existing spare grommet — do not drill a new opening through the step box wall.

Fig. 7 — Harness routed through spare rubber grommet in step box wall.
Fig. 8 — Route & secure as necessary up to DCD
Fig. 9 — Ring terminal connected to AUX breaker, torqued to 15 in-lbs.

Step 4 — Route the harness up to the DCD panel, securing it with wire ties as needed along the way.
Step 5 — Attach the harness ring terminal to the AUX breaker on the DCD panel.
Step 6 — Torque the AUX breaker terminal screw to 15 in-lbs using a calibrated torque screwdriver.
Note: Do not over-torque. Exceeding 15 in-lbs can damage the breaker terminal.

Instructions — Reassembly and Test
Step 1 — Re-install the DCD panel.
Step 2 — Wire-tie the in-line fuse holder on the new EL-0189 harness to existing cables in any
accessible location to keep it secured during transit.

Rev: [06.26.2026}

Page 6 of 7

PCN 27-51039 / TSB

TECHNICAL SERVICE BULLETIN

LP SOLENOID POWER SOURCE RELOCATION

TSB:

26-003: M920029

Date:

5/13/2026

Product:
Repair Time:

Lineage M-Series 25FW
0.5h

Step 3 — Re-install the entry step cover.
Step 4 — Reconnect the chassis battery and turn all house battery breakers ON.
Step 5 — Test the LP shut-off switch. Confirm the LP solenoid energizes and de-energizes as the switch
is cycled.

Fig. 10 — LP shut-off switch tested — indicator illuminated when energized.

Verification
Before returning the unit to service, verify the following:
•
•
•
•
•
•
•

All abandoned chassis-battery feed wires are capped and secured with no exposed conductors.
EL-0189 harness butt-splices at the LP switch are properly crimped and insulated.
Harness is routed through the existing rubber grommet (no new openings drilled).
AUX breaker terminal screw is torqued to 15 in-lbs.
All harness sections are wire-tied so no wire can fall, chafe, or move during transit.
DCD panel and entry step cover are reinstalled with all original fasteners.
LP shut-off switch operates correctly and the LP solenoid responds to switch input.

Rev: [06.26.2026}

Page 7 of 7

PCN 27-51039 / TSB