3-35. SPEED-SENSING ALTERNATOR
This task covers:
Tool kit SC4940-97-CL-E12
Drycleaning solvent (Item 34, Appendix B)
1. If the locomotive does not transition before removing speed-sensing alternator, perform the following:
a. Connect positive lead of multimeter to TB1-M and negative lead to TB1-K.
b. Operate the locomotive to the speed where transition should take place (approximately 10 to 15 mph).
c. The indication on the multimeter should be 10 V ac or more.
d. If a 10 V ac signal is present on TB1-M, transition relay panel is probably defective. If no signal is present,
speed-sensing alternator is probably defective.
High voltage is used in the operation of equipment. Do not be
misled by the term LOW VOLTAGE. Potentials as low as 50 volts
may cause death.
Remove rings, bracelets, wristwatches, and neck chains before
working around the locomotive. Jewelry can catch on equipment
and cause injury, or may short across an electrical circuit and
cause severe burns or electrical shock.
2. Open electrical equipment cabinet door and set battery switch to OPEN.