Glow Plug Switch (Briggs/Daihatsu Diesel Engine)
The glow plug switch is located on the control panel on
vehicles powered with a diesel engine. This rocker
switch allows the glow plugs to be energized.
3
2
1
4
The switch terminals are marked as shown in Figure 20.
The circuitry of the glow plug switch is shown in the chart
below. With the use of a multimeter (ohms setting), the
switch functions may be tested to determine whether
continuity exists between the various terminals for each
position. Verify continuity between switch terminals.
6
5
Figure 20
SWITCH
POSITION
NORMAL
CIRCUITS
OTHER
CIRCUITS
OFF
2 + 3
1 + 2
5 + 6
4 + 5
MOMENTARY
ON
Diodes (Briggs/Daihatsu Gas and Diesel Engine)
Diodes D1 and D2 are used for circuit protection from
voltage spikes that occur when a solenoid is de–ener-
gized. Diode D1 is in the optional hydraulic circuit and D2
is in the starting circuit.
2
These diodes plug into the vehicle wiring harness at vari-
ous locations (see appropriate vehicle electrical sche-
matic in Chapter 11 – Electrical Schematics).
3
1
Testing
The diodes can be individually tested using a digital
multimeter (diode test or ohms setting) and the table to
the right.
Figure 21
3.
1.
2.
Diode
Male terminal
Female terminal
Multimeter
Red Lead (+)
on Terminal
Multimeter
Black Lead (–)
on Terminal
Continuity
Female
Male
Male
YES
NO
Female
Workman 3000/4000 Series
Page 8 – 15
Electrical System
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