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Author, Motojournalist, Riding Skills Instructor
Americade Electrical Seminar
Answers to Wiring Diagram Questions
Question 1:
Question 2:
Question 3:
The 4 instrument lights are out when the key is in the “ON” position. The oil
pressure light (marked with an “O”) is operating. What fuse powers the
instrument lights and what is the wire color at the ignition switch that provides
power to the instrument lights?
pressure light (marked with an “O”) is operating. What fuse powers the
instrument lights and what is the wire color at the ignition switch that provides
power to the instrument lights?
Answer:
The taillight fuse (No. 5) powers the instrument lights. The wire from the fuse
is orange/blue. At the connector located to the right of the ignition switch,
the wire changes color to green where it goes to the ignition switch.
Fromthere is passes through a connector (below the instrument cluster)
where it powers the four instrument bulbs.
is orange/blue. At the connector located to the right of the ignition switch,
the wire changes color to green where it goes to the ignition switch.
Fromthere is passes through a connector (below the instrument cluster)
where it powers the four instrument bulbs.
How does the oil pressure warning light work? (the light is located in the
tachometer and marked as “O”). What is the power source? What is the
ground return? What would be the problem if it were stuck “ON” all the time?
tachometer and marked as “O”). What is the power source? What is the
ground return? What would be the problem if it were stuck “ON” all the time?
Answer:
The oil pressure light gets power from Orange/Green wire going to the
instrument cluster. This is the same wire that also powers the neutral light,
tach and fuel gauge. The Orange/Green wire goes from the instrument
cluster to fuse #4, the turn signal fuse. The oil pressure light’s ground is the
Green/Yellow wire.
When the engine is not running and the ignition switch is on, the oil
pressure switch (located at near the bottom left of the diagram) grounds the
Green/Yellow wire to turn on the oil pressure light. When the engine starts,
oil pressure opens the oil pressure switch and the warning light goes out. If
the oil pressure light were on all the time (and the engine has oil pressure)
either the oil pressure switch is bad (always closed) or there is a short to
ground in the Green/Yellow wire causing the oil pressure light to be on all
the time.
instrument cluster. This is the same wire that also powers the neutral light,
tach and fuel gauge. The Orange/Green wire goes from the instrument
cluster to fuse #4, the turn signal fuse. The oil pressure light’s ground is the
Green/Yellow wire.
When the engine is not running and the ignition switch is on, the oil
pressure switch (located at near the bottom left of the diagram) grounds the
Green/Yellow wire to turn on the oil pressure light. When the engine starts,
oil pressure opens the oil pressure switch and the warning light goes out. If
the oil pressure light were on all the time (and the engine has oil pressure)
either the oil pressure switch is bad (always closed) or there is a short to
ground in the Green/Yellow wire causing the oil pressure light to be on all
the time.
You’re trying to diagnose a no-spark problem. You have determined that
there is no power at either of the ignition coils (orange/white wires) when the
ignition switch is in the “ON” position. Trace the path that power from the
battery takes to get to the ignition coils. Include what wires (colors)
/fuses/switch/relays are used.
there is no power at either of the ignition coils (orange/white wires) when the
ignition switch is in the “ON” position. Trace the path that power from the
battery takes to get to the ignition coils. Include what wires (colors)
/fuses/switch/relays are used.
Answer:
Starting at the battery positive terminal power follows the Red wire to the
starter solenoid where it goes through the main fuse. From the fuse it comes
out of the solenoid on the Red wire (not the one going to the alternator).
The Red wire goes to the ignition switch. When the ignition switch is in the
ON position all the wires at the ignition switch will have 12-volts.
That was the easy part. There are now 5 wires coming out of the ignition
switch all with power. Rather than trace each one go to the Orange/White
wire at the ignition coils and work backwards to the ignition switch. From the
coils the Orange/White wire goes to the engine stop switch. The “Run”
position on the stop switch is an Orange/Blue wire that goes to the side
stand relay (top right of the diagram). The high-amperage contacts inside
the relay pass power to the Orange/Yellow wire where it goes to the number
“3” ignition fuse. Notice that the Orange/Yellow wire branches out in several
directions. This is a clue that this is a power wire that feeds other
components/circuits in the diagram. From the ignition fuse (#3) the wire
color is Orange. This wire goes back to the ignition switch and other
locations.
The fast way to diagnose no power at the ignition coils would be to check
the ignition fuse (#3) first. If the fuse had no power the ignition switch
Orange wire would be checked next, followed by the Orange/Blue wire at the
side stand relay.
starter solenoid where it goes through the main fuse. From the fuse it comes
out of the solenoid on the Red wire (not the one going to the alternator).
The Red wire goes to the ignition switch. When the ignition switch is in the
ON position all the wires at the ignition switch will have 12-volts.
That was the easy part. There are now 5 wires coming out of the ignition
switch all with power. Rather than trace each one go to the Orange/White
wire at the ignition coils and work backwards to the ignition switch. From the
coils the Orange/White wire goes to the engine stop switch. The “Run”
position on the stop switch is an Orange/Blue wire that goes to the side
stand relay (top right of the diagram). The high-amperage contacts inside
the relay pass power to the Orange/Yellow wire where it goes to the number
“3” ignition fuse. Notice that the Orange/Yellow wire branches out in several
directions. This is a clue that this is a power wire that feeds other
components/circuits in the diagram. From the ignition fuse (#3) the wire
color is Orange. This wire goes back to the ignition switch and other
locations.
The fast way to diagnose no power at the ignition coils would be to check
the ignition fuse (#3) first. If the fuse had no power the ignition switch
Orange wire would be checked next, followed by the Orange/Blue wire at the
side stand relay.
Thanks for attending the Motorcycle Electrical seminar at Americade. Below
are the answers to the questions on the handout that was distributed at the
seminar. More wiring diagram explanations and questions can be found in
the Motorcycle Electrical book.
are the answers to the questions on the handout that was distributed at the
seminar. More wiring diagram explanations and questions can be found in
the Motorcycle Electrical book.
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