Regal LS4C Owner's Manual page 173

DC ELECTRICAL SYSTEM
DIAGNOSTIC CHART
Problem
No 12 Volt Power At Battery
Battery Not Charging While Engine Is
Running
Battery Will Not Hold Charge
12 Volt Equipment Not Working
Possible Cause
Battery switch turned off
Weak or dead battery
Battery cables loose/disconnected
Faulty alternator
Faulty circuit wiring
Faulty battery charger/battery
Faulty/ old battery
Loose battery cables
Corroded battery terminals
Fuse blown-Take time to investigate why the
equipment was drawing too much current or
why it had a short circuit. Check fuses at fuse
block and under the engine shroud
Weak or dead battery if all 12 volt equipment
fails to function.
Corroded/loose wire connection
Internal equipment short/failure
173