Blue Sea Systems 7521 P12 Battery Charger - 12V DC 25A - Manual (Page 25)

Specifications are subject to change. See bluesea.com/P12 for current information.
Optional Installation
(continued)
ML-ACR Installation Instructions (PN 7620 and PN 7622) to Enable Start Isolation*
1. Disconnect the black ground wire connected to the ML-ACR wire harness.
2. If present, disconnect all Start Isolation wires connected to the Brown, Green, and Orange wires in ML-ACR wire harness.
NOTE: This connection can be made at the start key switch or at the starter solenoid, but must be to the line that is +12V DC positive only when cranking. Connection to
a line that is positive while the engine is normally running will prevent the charging relay from working properly.
5. Re-connect the black DC Negative (Ground) wire in the ML-ACR wire harness
6. If connecting two ML-ACRs repeat steps 1 through 5 using the second ML-ACR, engine, and the P12 Battery Charger ports associated with ACR 2
4. Connect a wire from the ACR 1 terminal marked “ES” (Engine Start Switch) to the terminal or wire running from the start key switch to the starter solenoid.
NOTE: Connecting the “SI” (Start Isolation) wire to only one of the ML-ACR isolation wires will not properly integrate the P12 battery charger with your ML-ACR.
3. Connect a wire from the ACR 1 port marked “SI” (Start Isolation) on the P12 Battery Charger to both the Brown and Green wires in the ML-ACR wire harness.
23
DC GROUND
Temperature
Sensor
Remote
Display
ACR 1 ACR 2
SI: Start Isolation (ACR)
ES: Engine Start Switch
ES SI ES SI
Temperature
Sensor
Remote
Display
ACR 1 ACR 2
SI: Start Isolation (ACR)
ES: Engine Start Switch
ES SI ES SI
ENGINE
START
SWITCH ON
OFF
START ENGINE
START
SWITCH
A B
ML-Series
Automatic
Charging
Relay
A B
START ISOLATION #2 (GREEN)
ENGINE ISOLATION #3 (ORANGE)
START ISOLATION #1 (BROWN)
GROUND (BLACK)
ML-Series
Automatic
Charging
Relay
ISOLATION #2 (GREEN)
ISOLATION #3 (ORANGE)
ISOLATION #1 (BROWN)
GROUND (BLACK)
7520
BATTERY CHARGER LED REMOTE
OPTIONAL CONNECTION OPTIONAL CONNECTION
START
HOUSE
START
ON
OFF
START
* The ML-ACRs also support “Engine Isolation” which
keeps an ACR open if two engines are running
simultaneously. Operating in this mode while using
Charger Coordination requires a special installation.
See bluesea.com/P12 for details.
P12
7521 AND 7522 BATTERY CHARGERS