Chevrolet 1993 S-10 Pickup Owner's Manual page 127

Voltmeter
Standard Cluster
Digital Cluster
I
KO278
When your engine is not running, but the ignition is on (in the Run position),
the gage shows your battery's state of charge in DC volts. When the engine
is running, the gage shows the condition of the charging system. Readings
between the low and high warning zones indicate the normal operating range.
On the digital cluster, a box around the voltmeter symbol will begin to flash
when the charging system needs service.
You can only drive for a short time with the reading in either warning zone. If
you must drive,
turn off all unnecessary accessories.
Readings in either warning zone indicate a possible problem in the electrical
system. Have the vehicle serviced as soon as possible.
mailer Wiring Harness
Your vehicle may have either a 5-wire or 7-wire harness.
The 5-wire harness is stored along the left rear frame crossmember. The
harness has no connector, and you should have a qualified service person
wire your harness for you. It must be routed out of your vehicle and attached
so that the trailer
or
the body won't pull it.
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