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Temperature Gauge (GM 3000–D)
The temperature gauge can be tested using a new
gauge as a substitute or by the use of a DC voltage
source and a variable resistance box.
1. Connect the temperature gauge to the variable re-
sistance and DC voltage source (Fig. 34).
2. Adjust resistance until the gauge needle points to
following test points on the gauge (Fig. 34):
A. At 220_F the resistance setting should be from
125.2 to 138.4 ohms.
B. At 150_F the resistance setting should be from
475 to 525 ohms.
3. Disconnect the voltage source, gauge, and variable
resistance.
+
–
14 VDC
S
I
G
150_F
220_F
VARIABLE
RESISTANCE
Figure 34
Oil Pressure Switch (GM 3000–D)
The switch is located on the left side of the engine block
above the oil filter. It is a normally closed switch and
opens with increasing oil pressure. The operating range
for the switch is 6.1 to 8.4 PSI (0.42 to 0.58 Bar).
Testing with the Engine Off
1. Turn the ignition switch to ON. The oil pressure lamp
should be on.
2. If the lamp does not come on in step 1 above no, dis-
connect the gray wire from the switch and ground it to
the engine block.
A. If the lamp comes on the switch is bad.
B. If the lamp does not come on in step 2, check the
indicating circuit (see Electrical Schematic
(GM3000–D)).
Testing with the Engine On
1. If the lamp is on with the engine running, shut off the
engine immediately.
2. Disconnect the gray wire from the switch.
Figure 35
3. Turn the ignition switch to ON. The oil pressure lamp
should be out.
4. If the light is still on, check for short circuiting in the
indication circuit (see Indicating and Safety Circuits).
5. Return ignition switch to OFF.
6. Test engine oil pressure (see Peugeot Citroen Mo-
teurs TUD5 Overhaul Checking Tuning manual).
Electrical
System
Groundsmaster 3000/3000–D
Page 6 – 21
Electrical System