HARNESS VOLTAGE TEST
2. Connect a jumper wire between regulator and
output terminal. Start engine and run at idle. If
charging voltage (13.8-14.8 volts) is present at
output terminal, the diode-trio is probably defec-
tive and alternator should be removed for repair.
With ignition off, unplug red/purple wire and check for
battery voltage at harness wire. No voltage at har-
ness wire indicates wiring harness is “open” and
should be repaired or replaced.
a
a
b
d
e
d
b
c
c
73084
73082
a - Output Wire (ORANGE)
b - Sensing Wire (RED / PURPLE)
c - Voltmeter (0-20 Volts)
d - Ground
a - Regulator Terminal
b - Output Terminal
c - Ground
d - Jumper Lead
e - Voltmeter (0-20 Volts)
OPEN DIODE-TRIO TEST
CURRENT OUTPUT TEST
1.
With ignition on and engine not running, check for
battery voltage at alternator output terminal (Test
Perform this test to check if alternator is capable of
producing rated current output, using a 0-50 amp DC
ammeter.
1)
and 1.5 to 3.0 volts at regulator terminal (Test
2).
!
WARNING
Be sure that engine compartment is well-venti-
lated and that there are no gasoline vapors pres-
ent (during the test) to prevent the possibility of
an explosion and/or a fire, should a spark occur.
1.
Disconnect negative (–) battery cable from bat-
tery.
a
2. Disconnect orange lead from alternator output
terminal and connect ammeter in series between
lead and output terminal. Connect positive (+)
side of ammeter toward output terminal.
c
b
d
3.
4.
Reconnect negative battery cable.
73083
Remove coil high-tension lead from distributor
cap tower and ground it to block. Turn on all ac-
cessories and crank engine over with starter mo-
tor for 15-20 seconds.
a - Regulator Terminal
b - Output Terminal
c - Ground
d - Voltmeter (0-20 Volts)
Index
90-823224--2 796
CHARGING SYSTEM - 4C-23
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you