B
ELECTRICAL
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
115
Repair and Service Manual
699322
Do not arc spark plug wire to
ground. Connect to a known good
spark plug and ground plug to a
clean metal surface (muffler, cylinder, etc.). Perma-
nent damage may be caused to the coil or igniter if
the plug is not grounded properly.
Ensure no fuel vapors are present that could be
ignited by the spark test.
If the engine will
not
run, but the starter will turn the
engine, proceed as follows:
1. Check for loose terminals, wires and connections.
2. Check for an electrical discharge through the spark
plug wire as follows: Using a spark plug that is known
good, and with a spark plug installed in the cylinder,
place on a clean grounded engine surface, (muffler,
cylinder, etc.). Turn over the engine with the starter.
Look for a blue electrical arc at the spark plug elec-
trode.
3. If there is either a weak arc or no arc, try a new spark
plug, then check the condition and the tightness of
the spark plug wire. Plug wires can be checked by
substituting them with good ones.
4. Replace the plug if necessary. Gap the spark plug
.028" - .030" (.71 - .76 mm) using a wire type spark
plug gauge.
T
Fig. 2 Resistance Between B - A and B - C
A normal reading with the negative lead on C and the
positive lead on A would be: 2 - 18 K
A normal reading with the negative lead on C and the
positive lead on B would be: 10 - 30 K
Fig. 3 Resistance Between C - B and C - A
TESTING STARTING CIRCUIT
To prevent the possibility of injury
resulting from vehicle inadvertently
starting, disconnect battery for
steps 1 through 8 (see the SAFETY
section).
Tool List
Qty.
DVOM ......................................................................... 1
If the engine will
not
turn over, proceed as following (Ref.
Fig. 1):
1. Check the battery for a voltage reading which should
be between 12.2 and 12.5 volts. Inspect for loose or
dirty battery post connections.
2. Check for a blown in line fuse and replace if neces-
sary with a 7 amp fuse.
3. Check for loose wires at all terminal connections.
4. Check the complete electrical system for correct cir-
cuitry.
5. Inspect for worn insulation or bare wires touching the
frame. Bare wires will cause a short circuit.
6. Check for continuity through the key switch. Set the
DVOM to the ohms (
scale. Detach wires. Place
positive (+) probe on one terminal and negative (-)
C
A
B
+ TEST LEAD
- TEST LEAD
C
A
B
+ TEST LEAD
- TEST LEAD
C to B
C to A
Содержание LS2 2020
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