DC System Troubleshooting
Compass
A compass is installed on each boat to aid in navigation. A magnetic compass is often deflected by iron,
magnets, or electrical current from nearby wiring and must be adjusted to compensate for these
influences. Only a qualified technician should perform compass adjusting/compensation. Since it is
seldom possible to correct compass deviation to zero, a deviation card is created to indicate the correct
heading that must be utilized when navigating by compass. Keep this card near the helm and refer to it
as necessary.
Problem Cause
Solution
No power to 12V equipment Battery disconnect switch to OFF Turn switch ON.
Battery selector switch turned to OFF Switch selector switch ON for port (1) or
starboard (2) battery.
Weak or dead battery Recharge battery. Replace if necessary.
Engine running, battery not
charging
Engine alternator belt loose Tighten belt.
Battery not holding a charge Bad battery Replace battery.
12V device not working Circuit breaker for device is OFF Switch breaker to ON.
Weak or dead battery Change battery selection switch position
(if available); charge battery.
Faulty electrical connection Check 12V connections.
Tighten or repair as needed.
Figure 3-46. Compass
3-21 3-21
Disconnect battery cables before performing all inspections,
checks, troubleshooting and repairs to avoid possible
personal injury and damage to equipment.
WARNING
Systems
Table 3.6. DC System Troubleshooting Chart
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