MJM Yachts 29z Outboard - Manual (Page 26)

CHAPTER 6 ELECTRICAL SYSTEM
- 26 - 29z
6.4 REVERSE POLARITY
As a safety precaution, your AC panel is fitted with reverse polarity
indicators. If an AC supply were wired incorrectly, either aboard your boat or shoreside, a
dangerous shock situation could exist. Normally, the reverse polarity lights should not be
illuminated. If they are, disconnect that source of power and alert the appropriate person.
6.5
ELECTROLYSIS & GALVANIC CORROSION
Metallic fittings that are exposed to saltwater are subject to electrolysis and galvanic corrosion. To
minimize potential damage, your boat is fitted with a sacrificial zinc at the transom. This zinc is
connected to the bonding system of your boat. It should be visually inspected whenever possible
and replaced when 1/2 of the zinc has been eroded. Pay special attention to its condition when in
new waters and marinas, as environmental conditions affect the rate of deterioration. If the zinc
erodes rapidly, current meters can be used to assess possible causes and remedies.
See Section 3.4, there is an engine zinc to monitor frequently as well.
6.6 BONDING
The bonding system of your boat connects all underwater metallic fittings to the sacrificial zinc
and the boat’s negative bus bar. In order for the zinc to protect an underwater part, the
connection must be clean and secure. The green wires that make up this system are not normally
current carrying.
6.7 ELECTRICAL
SAFETY
Please read and understand the important safety precautions included in the included NMMA
publication “Sportfish, Cruisers, Yachts – Owner’s Manual” concerning electrical safety.
6.8 GENERATOR
(Option) See Northern Lights 673D 5KW Operating Manual.
BREAK-IN PERIOD Change engine oil and filter at 50 hours and again at 100 hours. Oil
consumption is greater until piston rings are seated. Maintain at least a 75% load on the
generator for the first 100 hours, varying the load to help seat the rings.
PRESTART CHECKS [refer to Figure 2 & 3 on next page]
(1) Check that cooling water is 1” below filler cap [2]
(2) Check the oil at dipstick [22]
(3) Open fuel line lever over starboard fuel tank.
(4) Close the raw water seacock, check & clean sea strainer & reopen the seacock (port locker)
(5) Reach behind the Generator Control Box [13] and be sure that the AC Circuit Breaker [14]
and AVR Circuit Breaker [28] are both in the “Up” position
(6) Turn ON battery switchfor Generator. Note the battery switch must always be kept ON while
the generator is running. If the switch is turned OFF with genset running, the battery charging
regulator could be ruined.
(7) Turn OFF all AC Panel 1&2 switches/breakers, including Generator double-handled switches
on top of AC Panels 1 & 2 and AC Breakers below.
PREHEAT: On the Northern Lights Generator Control Panel on the face of the piloting console
depress PREHEAT switch ON for 10-20 seconds to activate control system