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Dual Acting XPT System Troubleshooting Guide
Before proceeding with the tests below, verify that each orange power wire is connected to a live positive power source, and that the
fuses* are not blown. Make sure that each black wire has a good connection to ground.** After this is complete, conduct the tests below.
STEP 1A — Troubleshooting for Port DAHPU and Port Dual Acting Relay Module
Unplug the port Dual Acting Hydraulic Power Unit (DAHPU) from the Port Dual Acting Relay Module (RMPORTDA). Using a hot lead,
directly power the DAHPU plug as shown below:
Touch positive to Red and Blue Simultaneously
Touch positive to Green and Blue Simultaneously
If the port trim tab does not move when DAHPU is powered direct, then the port DAHPU or port actuator(s) are faulty. Contact Bennett Marine.
If the port trim tab still moves, plug the DAHPU back into the Port Dual Acting Relay Module (RMPORTDA). Unplug the RMPORTDA
from the EIC Dual Pump Cable (Y-Harness). Take the RMPORTDA and using a hot lead directly power the three-color wire pigtail
featuring a red heat shrink collar as shown below:
Touch positive to Red and Blue Simultaneously
Touch positive to Red and Yellow Simultaneously
If the port trim tab does not move when powered through the Port Dual Acting Relay Module, then the RMPORTDA is faulty.
STEP 1B — Troubleshooting for Starboard DAHPU and Starboard Dual Acting Relay Module
Unplug the starboard Dual Acting Hydraulic Power Unit (DAHPU) from the Starboard Dual Acting Relay Module (RMSTBDDA). Using
a hot lead, directly power the DAHPU plug as shown below:
Touch positive to Red and Blue Simultaneously
Touch positive to Green and Blue Simultaneously
If the starboard trim tab does not move when DAHPU is powered direct, then the starboard DAHPU or starboard actuator(s) are faulty.
Contact Bennett Marine for assistance.
If the starboard trim tab still moves, plug the DAHPU back into the Starboard Dual Acting Relay Module (RMSTBDDA). Unplug the
RMSTBDDA from the EIC Dual Pump Cable (Y-Harness). Take the RMSTBDDA and using a hot lead directly power the three-color wire
pigtail featuring a green heat shrink collar as shown below:
Touch positive to Green and Blue Simultaneously
Touch positive to Green and Yellow Simultaneously
If the starboard trim tab does not move when powered through the Starboard Dual Acting Relay Module, then the RMSTBDDA is faulty.
* This system could contain up to five (5) fuses — three (3) 1.5 amp, with two (2) 10 amp (24V) or two (2) 20 amp (12V). The boat builder could
have replaced these fuses with breakers, or used breakers and inline fuses.
** There are five (5) ground (black wires) — two (2) DAHPUs, two (2) Dual Acting Relay Modules and one (1) EIC Relay Module.
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Operation
Operation
Operation
Operation
Reaction
Port trim tab up
Port trim tab down
Reaction
Port trim tab down
Port trim tab up
Reaction
Starboard trim tab up
Starboard trim tab down
Reaction
Starboard trim tab down
Starboard trim tab up
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