Voltage Regulator Test; Removal Of Voltage Regulators - Mariner Mercury 135 JET Service Manual

VOLTAGE REGULATOR TEST

IMPORTANT: Make sure meter is "zeroed" by
shorting meter leads together after changing
selector knob to appropriate setting. The meter
reading must read "0" Ohms.
IMPORTANT: The following regulator tests
should be performed as soon as possible after
suspected regulator failure. A "cold" regulator
may test "GOOD" when in fact it is defective
when "warm".
Disconnect all voltage regulator wires.
Voltage Regulator Resistance
Test
Using Analog
Meter
Test Leads To-
Diode Check: Con-
nect NEGATIVE (–)
ohm lead to either
YELLOW lead. Con-
nect POSITIVE (+)
test lead to thick
RED lead.
Diode Check: Con-
nect NEGATIVE (–)
ohm lead to thick
RED lead. Connect
POSITIVE (+) ohm
lead to either YEL-
LOW lead.
SCR Checks: Con-
nect NEGATIVE (–)
ohm lead to either
YELLOW lead. Con-
nect POSITIVE (+)
ohm lead to case
ground.
Tachometer Circuit
Check: Connect
NEGATIVE (–) ohm
lead to case ground.
Connect POSITIVE
(+) ohm lead to
GRAY lead.
NOTE: Meters ground could be reversed for diode
test.
90-824052R3 JUNE 2002
Scale
(Ohms)
100-400 R x 10
20000 to R x 1K
8000 – R x 1K
15000
10000 – R x 1K
50000
Voltage Regulator Resistance
Test
Using Digital Meter
Test Leads To-
Diode Check: Con-
nect NEGATIVE (–)
meter lead to RED
regulator lead in
connector. Connect
POSITIVE (+) test
lead to either YEL-
LOW regulator lead.
Diode Check: Con-
nect NEGATIVE (–)
meter lead to either
YELLOW regulator
lead. Connect POS-
ITIVE (+) ohm lead
to RED regulator
lead in connector.
SCR Checks: Con- 1.5 volt –
nect NEGATIVE (–) or OUCH or
meter lead to regu-
lator case. Connect
POSITIVE (+) meter
lead to either YEL-
LOW regulator lead.
Tachometer Circuit
Check: Not measur-
able with digital me-
ter

REMOVAL OF VOLTAGE REGULATORS

1. Remove 4 locknuts and spacers from coil mount-
ing plate. Lay coil mounting plate off to one side.
Production Models –
a
a - 4 Locknuts
b - 4 Spacers (HIDDEN)
Scale
(Ohms)
0.4 – 0.8
volts
or OUCH
or OL
OL
b
a
51797
ELECTRICAL - 2B-7