John Deere 318 - Manual (Page 329)

3g
Ignition Coil Test:
Pimary Windings—
For Machines
(S.N. 420001— )
Key switch OFF.
Disconnect all wires
from ignition coil.
M45244 -UN-12JAN90
Using a ohmmeter,
measure resistance of
primary windings across
terminals (A).
Resistance should be
3.7—4.6 ohms when
temperature of coil is
approximately 20˚C
(68˚F).
RESISTANCE OK: GO
TO
3h
RESISTANCE NOT
OK: Replace coil, then
GO TO
Æ
, Group 05.
3h
Ignition Coil Test:
Secondary
Windings—
For Machines
(S.N. 420001— )
Key switch OFF.
Disconnect all wires
from ignition coil.
M45245 -UN-21JAN90
Using a ohmmeter,
measure resistance of
secondary windings
across spark plug wire
terminals (A).
Resistance should be
34.02—41.6 K-ohms
when temperature of
coil is approximately
20˚C (68˚F).
RESISTANCE OK: GO
TO
3i
RESISTANCE NOT
OK: Replace coil.
MX,159024025,48-19-16MAY95
MX,159024025,49-19-16MAY95
Electrical System Diagnosis/Ignition Circuit Tests
TM1590 (17MAY95)
240-20-17
316, 318 & 420 Lawn and Garden Tractors
020895
240
20
17