1968 Pontiac

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.

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1949 Chevrolet 1433 (Canadian 1 ton cab and chassis pick-up truck)
1968 Pontiac Parisienne (rust free survivor)
1973 Buick Centurion (four door hardtop; engine will be donated to a 1940's or 1950's Chev pickup when I find one)
1989 Chevrolet K3500 RC/LB (454 & single rear wheels)
1991 Chevrolet Caprice Classic (police cruiser clone)
1992 Chevrolet K2500 EC/SB (almost rust free daily driver)
1998 GMC C1500 EC/SB

MT-2500

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

__________________
Remember proper testing gives us the answer to many problems.
MT

1968 Pontiac

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?

__________________
1949 Chevrolet 1433 (Canadian 1 ton cab and chassis pick-up truck)
1968 Pontiac Parisienne (rust free survivor)
1973 Buick Centurion (four door hardtop; engine will be donated to a 1940's or 1950's Chev pickup when I find one)
1989 Chevrolet K3500 RC/LB (454 & single rear wheels)
1991 Chevrolet Caprice Classic (police cruiser clone)
1992 Chevrolet K2500 EC/SB (almost rust free daily driver)
1998 GMC C1500 EC/SB

MT-2500

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

__________________
Remember proper testing gives us the answer to many problems.
MT

1968 Pontiac

Thanks MT.

__________________
1949 Chevrolet 1433 (Canadian 1 ton cab and chassis pick-up truck)
1968 Pontiac Parisienne (rust free survivor)
1973 Buick Centurion (four door hardtop; engine will be donated to a 1940's or 1950's Chev pickup when I find one)
1989 Chevrolet K3500 RC/LB (454 & single rear wheels)
1991 Chevrolet Caprice Classic (police cruiser clone)
1992 Chevrolet K2500 EC/SB (almost rust free daily driver)
1998 GMC C1500 EC/SB