126 electrical systems troubleshooting
+–
Windlass
- Wiper
Overcurrent
protection
Blower
Bilge pump
Float switch
Float switch
Grounding conductor Grounding conductor
Grounded
conductors
Engine Engine
Battery
switch
DC main
negative
bus
Accessory
negative
bus
DC negative bus
Parallel switch
or solenoid
AC grounding bus
Battery
switch
Fuel tank
Fill Gauge
Electronics
ground plate
Immersed lightning ground plate or strip
Lightning down conductor
(from lightning mast)
Large metal objects
Chainplates
Engine
negative
terminals
Seawater strainer
Seacock
+ +
+
Fuel tank
House
battery
Start
battery
Start
battery
Horn
Sacrificial zinc
Grounding bus Bondingconductors
Grounding AND
bonding conductor
Gauge Fill
Distribution Panel
Main feed
Overcurrent
protection
FOR
CORROSION
PROTECTION FOR
LIGHTNING
PROTECTION
FOR
SYSTEM
GROUNDING
A typical DC negative system and DC grounding system, adapted from ABYC Standard E-11, Figure 18. (Reprinted with
permission from Boatowner’s Illustrated Electrical Handbook,second edition, by Charlie Wing)