AUTOMOTIVE 12 VOLT SYSTEM
The primary point to keep in mind about the unit’s 12V system is that the automotive chassis alternator
supplies power to both the automotive systems as well as any coach battery and directly to the RV living
quarters while the vehicle’s motor is running. Thus, of primary concern to you is the condition of the vehicle’s
electrical system and especially the alternator.
The alternator compensates for electrical usage in the vehicle…the power drawn by the appliances, lights,
fans and other 12V powered items as well as the charging of the automotive and coach batteries.
If the alternator isn’t keeping pace with the draw on the unit’s electrical system, while driving down the road, it
means you are working in a negative mode: more power is being used than the unit is putting out.
This means that you are taking power out of the batteries. If you draw too much power from the batteries there
may not be enough power left in the battery to start the RV or run any of the appliances when you stop for a
break or for the night.
So, always be aware of the alternator’s output. Also check the monitor panel frequently to see that the coach
batteries are at full charge. To insure an accurate reading, utilize a 12 volt tester on the batteries.
The alternator will charge at a higher rate right after the vehicle has been started, replacing the power that was
used to start the vehicle, but the charging should quickly go back to “normal” and hold its own even when you
turn on lights or appliances.
When stopped at a campsite that allows you the use of the shoreline, the 120V electrical system will recharge
your coach battery.
When checking coach battery condition, turn on several interior lights to place a load on the battery. Under
heavy usage in warm weather, check the fluid level of the batteries often. Low battery fluid level is very harmful
to the battery’s longevity.
If the alternator shows a discharge while the motor is running, turn off appliances or lights to see if a charge
comes on or if the alternator indicates not charging. Then apply a drain on the system to see if a discharge
returns. If a discharge persists, contact your dealer.
Mandalay
10-7
Summary of Contents for 38A 2004
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Page 13: ...ITEM SERIAL NUMBER VALUE Mandalay 1 7 OWNER S PERSONAL PROPERTY RECORD...
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