RDG603A63 - Issue 10
Page 33 of 104
12. Electrics
CAUTION
•
Do not attach any part, hose or cable to the engine wiring harness. There is a warning
label attached to the harness to remind you of this.
•
Connect the wiring extension harness multi plug to the panel plug and the other end
to the engine.
•
Connect the start battery positive cable to the separate terminal post .
•
The starter motor battery cable must have a cross sectional area of at least 50mm
2
.
•
For twin alternator engines, connect the domestic battery positive cable to the 125A,
150A or 240A Alternator. The 125A and 150A alternator have a B+ terminal and the
240A alternator has a “pos out” terminal (see wiring diagram). This ensures that the
40A alternator charges the start battery and the 125A, 150A or 240A alternator
charges the domestic battery. This removes the requirement for a split charging
system or relay.
•
The engine is supplied with the domestic alternator belt not fitted. This is so that
domestic alternator damage does not occur if the engine is run without the domestic
battery back connected. The belt should only be fitted when the domestic battery bank
has been connected to the domestic alternator. Belt fitting and tensioning instructions
are in
Section 7
–
Service Procedure
. Make sure the alignment is correct.
•
A cable will need to be manufactured locally and fitted between the lower 150A or
240A alternator and domestic battery positive terminal. The cable should have a
minimum cross-sectional area of:
Cross Sectional Area
Shire 39, 43 & 49
40mm² (125/150A Alternator)
Shire 39, 43 & 49 (Option) 70mm² (240A Alternator)
24v 120amp Alternator
40mm²
•
Both negative battery terminals can be connected to a common earth point.
Note: The 240A alternator is of the insulated earth design and requires a heavy-duty earth
cable installed at all times.
Note: If an optional larger output alternator is fitted to either a new engine, or fitted to an old
engine as an upgrade, ensure that all cables, master switches, terminals, split charge relays
etc. are of sufficient capacity for the increased current.