User manual

Groundsmaster 4100--D/4110--DPage 5 -- 58Electrical System
Diode Assemblies
The Groundsmaster engine wire harness contains a
diode assembly that is used for circuit protection from
voltage spikes when the engine starter solenoid is de--
energized.
Groundsmaster models 30606 and 30608 use an addi-
tional diode assembly in the engine wire harness that
protects the engine EGR circuit from r everse polarity.
The diode assemblies plug into the wiring harness near
the engine starter motor (see engine wire harness draw-
ing in Chapter 10 -- Foldout Drawings). The diode as-
semblies can be identified by a black color and diode
symbol on end of diode assembly body.
Testing
The diode can be tested using a digital multimeter
(diode test or ohms setting) and the table to the right.
Figure 75
1. Diode assembly
2. Male terminal
3. Female terminal
4. End of diode body
1
2
3
4
Multimeter
Red Lead (+)
on Terminal
Multimeter
Black Lead (--)
on Terminal
Continuity
Female Male YES
Male Female NO
Resistor Assembly
On Groundsmaster machines with an 80 Amp alternator
(see Engine Specifications in Chapter 3 -- Yanmar Dies-
el Engine), the engine wire harness contains a resistor
that is necessary for ignition switch operation. The res-
istor plugs into the wiring harness near the engine start-
er motor (see engine wire harness drawing in Chapter
10 -- Foldout Drawings).
The resistor assembly can be identified by its gray color
and resistor symbol on end of resistor a ssembly body.
Testing
The resistor can be tested using a d igital multimeter
(ohms setting). The resistance across the resistor ter-
minals should be 1.6K ohms.
1. Resistor assembly 2. End of resistor body
Figure 76
1
2