New Holland T8010 Manual page 1336

Test point
1 Ignition in Off position.
Disconnect alternator
connector 85 and
instrument cluster
connector 61.
Measure resistance
between alternator
connector 85 and
instrument cluster
connector CN1, terminal
19.
2 Measure resistance
between alternator
connector 85 and in-line
connector 395M terminal
6.
3 Measure resistance
between in-line connector
395F, terminal 6 and splice
F6.
4 Measure resistance
between splice F6 and in-
line connector 60M,
terminal 12.
5 Measure resistance
between in-line connector
60, terminal 12 and
Instrument Cluster (ICU2)
connector CN1, terminal
19.
Section 55 - Electrical System - Chapter 1
C - RPM Circuit Test
Good Reading
Less than 1 ohm
If good reading, alternator
rpm circuit wiring okay.
Less than 1 ohm
If good reading, go to next
test point.
Less than 1 ohm
If good reading, go to next
test point.
Less than 1 ohm
If good reading, go to next
test point.
Less than 1 ohm
If good reading, alternator
rpm circuit wiring okay.
55-1-155
Possible Cause of Bad Reading
Open circuit in alternator rpm circuit.
Check all connectors for full installation,
loose corroded, pushed out, or bent
terminals.
Continue with next test point.
Open 126Y(DG) circuit between
connector 85 and connector 395.
Open 216C(Y) circuit between
connector 395 and splice F6.
Open 216B(Y) circuit between splice F6
and connector 60.
Open 216A(Y) circuit between
connector 60 and connector CN1.
Check all connectors for full installation,
loose, corroded, pushed out, or bent
terminals.