Notes - Merlin POWERGUARD PRO User's Installation Manual

IGNITION INHIBIT WIRE:
Where the PowerGuard Pro is connected to an engine start / vehicle chassis battery, the
Ignition wire (pink) MUST be connected to the engine's ignition switch.
When the ignition is on, PowerGuard Pro is disabled and will not disconnect batteries. The
remote battery switches will not work.
•
Caution & Warning! Failure to connect the ignition inhibit may cause damage to the engine
alternator and all electrics/electronics on board. Furthermore, critical safety loads like
electric power steering, ABS Brakes may cease to operate. ALWAYS connect the ignition
inhibit wire.
BYPASS LOADS:
There may be certain loads attached to the battery that should not be subject to flat battery
protection disconnection. For example, some engine management computers, hazard warning
lights etc. In some states/countries, these this may be mandated by law. Bypass loads should
be identified, individually fused and connected directly to the battery.
Note that any bypass load will eventually flatten the battery even after PowerGuard has
activated flat battery protection. However, normally, they draw only milliamps so should not
interfere with the normal operation of the vehicle/boat.

NOTES

FINAL CHECKS:
Once cabling is complete. We highly recommend following the checklist below before
reconnecting the main battery cables:
• CAUTION! Incorrect and reverse polarity may damage the system.
• WARNING! Reverse polarity connections to batteries may cause them to explode. Check
all cabling before powering up the system.
PRE POWERUP-CHECKS:
• Check security of each component.
• Check main battery cables against system diagrams.
•
Check main battery cables are correctly sized based upon rated loads.
• Check tightness of all connections.
• Ensure all live terminals are covered with rubber insulating boots.
• Check all negative connections are secure.
REF: QSF-030
Issue: D
Merlin Equipment Ltd
PowerGuard Pro – User and Installation Guide Page: 12 of 18