Opel 1900 1973, Service Manual

Page: 87 / 625

66 1973 OPEL SERVICE MANUAL
Condition Possible Cause Correction
Gas gauge does not read
full when tank tilled 1. Tank misadjusted
Install 40 ohm resistor
between connector and ground
I
(disconnect from unit). If
dash unit reads full within
one pointer width. Remove
gas tank unit from tank, install
connector, ground unit and
adjust tab to
full reading on
dash. Reinstall tank unit.
2. Defective’ voltage
s t a b i l i z e r 1. See corrective action above.
Gas gauge not operating
1. Corroded tank unit
t e r m i n a l
1. Check tank unit terminal, if
corroded clean, pack connector
with grease and reinstall
connector..
2. Loose dash gauge Install 40 ohm resistor between
sending unit connector. and
ground (disconnect from tank
terminal). If dashgauge does
not read rull, check dash gauge
attaching nuts for secureness
and tighten if required.
(Requires removal of dash panel)
Momentarily touch dash gauge
attaching studs to 12 volt
source. If indicator moves,
reinstall panel; if not, replace
gauge. (Caution do not keep
studs connected to 12 volt
source for more than a few
seconds damage to gauge can
result)
3. Open connector from sending
unit and ground (40 ohm
resistor may be used if
ohmmeter available. Remove
multiple connector from rear
of dash. Connect test light
to ground and touch other end
to connector socket with blue
and black wire, if it does not
light (40 ohm reading of ohm
meter used) repair open circuit.
4. Defective gas tank
sending unit
1. Install 40 ohm resistor between
temperature sending unit and
ground (disconnect from unit)
if dash unit reads full scale.
Replace tank unit (check for
terminal corrosion before
replacing).