Electrical Systems - Chassis --- Section 9
Cayman 2005
289
CHASSIS ELECTRICAL - INTRODUCTION
A majority of the chassis electrical functions are designed to operate from 12 Volt DC (direct
current) power. This is why the chassis batteries play such an important role in the function of the
motorhome. Therefore, it is important to keep the 12 Volt DC system(s) in good working order.
These systems, with their incorporated electronics, are voltage sensitive. If DC voltage is not
within specification, some electronic items may be damaged.
The two different systems, chassis and house, have their own batteries. The chassis battery supplies
12 Volt DC power to the front distribution panel located in an outside compartment by the roadside
front wheel. This panel contains mostly engine system fuses and wiring such as headlights, taillight,
dashboard functions, gauges, etc. The house batteries supply 12 Volt DC power to the distribution
panel located in the bedroom. This panel contains fuses for the house, interior lighting and appliances.
WARNING:
When welding is involved for motorhome repair or modification, only qualified,
experienced technicians should weld on the chassis. Improper welding procedures
and materials may weaken the assembly or result in damage that is not obvious
and may not cause an immediate problem or failure. Unauthorized modifications
or repairs to the chassis could result in a forfeiture of warranty coverage.
DANGER:
Due to the sensitive nature of the electronics on the chassis, the following precau-
tions are required to protect electrical components in the motorhome chassis:
1. Disconnect the (+) positive and (-) negative battery connection.
2. Cover electronic control components and wiring to protect from hot sparks.
3. Disconnect the terminal plugs from the engine Electronic Control Unit, located
on the passenger side of the engine block.
4. Disconnect all the plugs from the transmission Electronic Control Unit, located
in the roadside front electrical bay.
5. Disconnect the wiring from the alternator.
6. Do not connect welding cables to electronic control components.
7. Attach the welding ground cable no more than two feet from the part to be
welded.
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