Motion Sensor; Shift Interrupter Switch - MerCruiser GM4 Service Manual

b. Measure resistance between each high volt-
age tower and engine ground. Minimum re-
sistance - 10 megohms.

Motion Sensor

NOTE: Motion sensor is factory set and not adjust-
able.
IMPORTANT: Do not remove cover unless it is
damaged. There are no serviceable parts inside
the motion sensor. Replace entire unit if defec-
tive.
a
Motion Sensor
1. With ignition switch in the "OFF" position, discon-
nect motion sensor from ignition amplifier. Mea-
sure resistance between sensor terminals. Resis-
tance range - 140 to 180 ohms. (Rx10) If
resistance is not within specifications, replace
motion sensor.
Index
4B - 18 - IGNITION SYSTEM
IMPORTANT: Motion sensor must be at room tem-
perature, 68 F (20 C), when testing.
a - Check Resistance Between These Two Points

Shift Interrupter Switch

1. Disconnect ignition amplifier from engine har-
ness. Check for continuity between harness con-
nector (a) and engine ground. Switch is normally
open. When shifting out of forward or reverse,
switch will close momentarily.
74537
a
a - Check For Continuity From Here To Ground
a
90-816462 2-695