BT OE35, Service Manual

Page: 316 / 332

PS S8.0 8200
001 OE35
Version no T-code
F-code Section C-code
Micro 70 Wire Guidance
314 Service Manual 1997-10-24
not battery volts, replace emergency disconnect
contactor interlock switch. (Emergency disconnect
contactor must
be closed and interlock switch
activated.)
e. Check for battery volts at wire 96 connected to
terminal 4 of voltage regulator. If not battery volts,
repair open wire 96 between emergency disconnect
contactor interlock switch and voltage regulator.
f. Check for 24 volts at wire 70 on terminal 2 of voltage
regulator. If not 24 volts check integrity of negative
wire 13 to voltage regulator terminal 3 then replace
voltage regulator. The tests that follow are for all
voltage trucks. These voltage tests should be made
with the negative lead of the volt meter connected to
Micro 70 connector K1-2.
g. Check for battery volts on wire 2 at fuse holder of
fuse 1, 1 amp control fuse. If not battery volts repair
open wire 13 from Micro 70 connector K1-2 to truck
negative wire 13.
h. Check for 24 volts at wire 70 on Micro 70 connectors
K1-1, K6-12 and K8-10. If not 24 volts, repair open
wire 70 between emergency disconnect contactor
interlock switch (24 volt trucks), or voltage regulator
(36 volt trucks), and Micro 70 connectors. If still not
24 volts possible Mlcro 70 controller failure. Check
for 24 volts at Micro 70 connector K8-2. If not 24
volts, replace Micro 70 controller.
i. Check for 24 volts at wire 75 connected to terminal A
on #2 control relay. If not 24 volts, repair open wire
75 between Micro 70 connector K8-2 and 2 control
relay.
k. Check for zero volts at wire 13 connected to terminal
8 of #2 control relay. If not zero volts, repair open
wire 13 from 2 control relay to truck negative wire 13.
l. Replace #2 control relay.
m. Re-check truck symptoms and continue with other
test. Call BT Prime-Mover service department with
NOTE! Tests “e” and “f” are for 36 volt trucks only.
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