INSTRUMENTATION
SERVICE MANUAL NUMBER 24
Gauges
Circuits
Typical gauges are shown. One terminal is the positive (+), the second terminal is the ground
(–)
and the third terminal is the light. Some gauges will have a terminal for the sender (S).
The information below is how most gauges are marked.
IMPORTANT: Some tachometers may have a dial that has to be set to the type and/or num-
ber of cylinders the engine has before it will give the correct engine rpm.
If the gauges have different markings, contact that manufacturer.
1.
2.
3.
4.
The positive (+) terminal supplies 12v battery voltage to the gauge. The terminal may
be marked with a (+), POS, +12v, B+, IGN or I.
The ground (–) terminal is the ground for the gauge. The terminal may be marked with
a (–), G. GND, GRD or no mark.
The light terminal supplies 12v battery voltage to the gauge’s light. This terminal may
be marked with a LT, light, I or no mark. This terminal is usually next to the light bulb.
The sender terminal receives the signal from the sender on the engine. This terminal
may be marked with a S, SND or SEND.
IMPORTANT: When changing a gauge, do not overtighten bracket and distort case.
5.
When changing or testing a gauge, coat terminals with Quicksilver Liquid Neoprene to
protect them.
Oil, Fuel and Temperature
IMPORTANT: If testing proves gauge to be defective, it must be replaced as there is
no repair available.
TESTING
1.
2.
Turn ignition switch to OFF.
Remove wire from terminal S (SEND).
a
72965
Typical
a - Terminal S (SEND)
Index
Page 4D-4
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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