Volvo 940 - Manual (Page 128)

1993 Volvo 940
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Check the level of coolant in the expansion tank. Top-up, if necessary. See "Cooling System".
The engine must NOT be running when coolant is topped-up.
Electrical system
When replacing the battery or when carrying out work involving the electrical system, the following
should be observed:
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A battery connection to the wrong terminal will damage the diodes. Before connections are made,
check the polarity of the battery with a voltmeter.
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If booster batteries are used for starting, they must be properly connected to minimize the risk of the
diode being damaged. for correct connection, see "Jump starting" section.
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Never disconnect the battery circuit (for example, to replace the battery) while the engine is running,
as this will immediately ruin the generator. Always make sure that all the battery connections are
properly tightened.
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If any electrical/welding work is performed on the vehicle, the battery's ground lead (negative cable)
and all the connecting cables of the generator must be disconnected and the welder cables placed as near
the welding point as possible.
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If the radio has an anti-theft code and the battery has been disconnected, the code must be re-entered
before the radio will function properly.
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