TOHATSU MFS 8B Service Manual page 265

1. Remove cable terminal holder cover.
2. Disconnect cable coupler from charge coil, and measure
resistance.
This test can be made without removing parts.
Alternator (Charge Coil) Resistance
: Reference Value (at 20°C)
White (W) – Yellow (Y)
0.58 - 0.86 Ω
• Check wire harness for disconnection of lead wire and
defective connection.
• Check conductivity between each point by referring to the
following table. Value in ( ) is reference value.
• P e r f o r m t h e m e a s u r e m e n t w i t h a l l c o n n e c t i o n s
disconnected to make the component a separated unit.
This test can be made without removing parts.
Rectifier Tester Check Chart
Red
R
White
W
Black
B
Yellow
Y
· Measurement condition Circuit tester to be
used : HIOKI3030
Measurement Range : 1kΩ
· Permissible Error of Resistance : ±20%
Note) It is recommended to use "HIOKI HiTESTER MODEL 3030" for this measurement. Use of other instrument
model for the measurement can cause indication of abnormal value for normal condition, resulting in
inaccurate measurement.
Disconnect all connections to measure as an independent unit.
Any movement of pointer indicates "ON" or "conductive" state.
The value in ( ) is the condition applied when "1kΩ" range is used. The measurement varies widely among types of
instrument, situations (such as inner power supply), or measurement ranges due to diodes used in the unit.
4st 8/9.8 2016
"ON" means "conductive", and "OFF"
Tester Lead Positive (+) Side (Red)
Red White
R W
ON
(7kΩ)
OFF
OFF OFF
OFF OFF
means "non-conductive".
Black Yellow
B Y
ON ON
(5kΩ) (7kΩ)
ON OFF
(7kΩ)
OFF
ON
(7kΩ)
8-21