Dodge Sprinter 3500 - Manual (Page 161)

CODE XA4
159 ELECTRICAL
AUXILIARY BATTERY DISCONNECT
Cutout relay for
additional battery
Details and Technology
The relay is installed on the charge line to the auxiliary battery. It separates the starter battery circuits
from the auxiliary battery circuits. When the engine is running, the relay allows both batteries to be
charged or discharged simultaneously.
Benefits and Arguments
• Starter battery cannot be discharged by auxiliary devices
The cutout relay prevents the starter battery being drained by devices connected to the auxiliary battery.
It also prevents the auxiliary battery being drained by the standard equipment such as the starter or fan.
Remarks
Auxiliary Battery Disconnect (XA4) is included with 100-amp Auxiliary Battery (BC1).