Stairmaster Freeclimber series Service Manual page 7

FREECLIMBER/4000 PT
This test should be used on machines with a "no-resistance" problem.
Turn power off.
Remove black wire from B+ terminal on alternator.
Remove brown wire from field terminal on alternator.
Place alligator clips on the B+ terminal and the field terminal of the alternator.
Run on machine for 10-15 seconds.
If full resistance is achieved during this time, your alternator has correct current flow. It is accepting
current (field) and producing current (B+).
Replace the alternator if no resistance is found
*Don't forget about the possibility of mechanical resistance. Worn chains, bushings, etc., may provide some
resistance.
Check VDC at the end of removed brown wire.
Perform the positive output to field test on the alternator.
Check the diode (.500-diode check range).
If you are not getting an "Enter Weight" prompt when you step on the pedals, perform this test with the power
on:
Remove blue wire from alternator.
Remove wire nut from where the two white wires come together.
Momentarily touch the 2 white wires to the blue wire.
If "Enter Weight" appears, then the alternator is bad.
Check continuity of blue wire, and cross check against all other wires.
Swap consoles if available.
Page 8
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ELECTRICAL CIRCUIT TESTS
Positive Output to Field Test
Field Circuit
AC Tap
* For 4000 PT machines prior to 11/97