On my 92 k2500 when I turn on the fan the volt gauge drops well below 14 volts. I'm wondering if this is normal or if the blower motor may be dying. Is there a way to check the blower motor? This truck doesn't have AC (or any other power options), and last year I installed a rebuilt Delco 85amp alternator. Thanks.

Does it blow air as normal or slow down?
Dash gauge readings are not very good.
Always check voltage at battery or fuse box.

A amp meter will check amp draw on blower motor.
Is it poping any fuses or resistors?
MT

Does it blow air as normal Yes
or slow down No?
Dash gauge readings are not very good.
Always check voltage at battery or fuse box.

A amp meter will check amp draw on blower motor.
Is it poping any fuses or resistors?No
MT

See replies above
Voltage at the battery measures 14.08 at idle & no blower.
Voltage at the battery measures 13.96 at idle & with blower set at high speed.

What is the correct way to measure the draw?

You need a good volt/amp metere to read whatamps it is pulling.
your battery voltage is good.
If not blowing fuse or resistors packs and the blower is blowing good.
I should be ok.
MT

Thanks MT.