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Important: The Caterpillar® diesel engine (RPO LG5) uses a 21 SI Series
Delcotron® generator. In addition to other circuits, this charging
system requires a circuit to supply power to the generator that provides
an additional electromagnetic boost to the generator rotor during startup
and low engine rpm. The circuit must provide from 10ohms to 50ohms
overall resistance to the generator regulator.
The instrument panel (IP) wiring harness has a resistance wire on circuit 25 (WHT).
This circuit is switched to the battery by the ignition and start switch.
The circuit is part of the battery charge indicator circuit. Depending on
which has the lower resistance, the battery charge indicator or the resistance
wire provides the required resistive current flow to a diode then to the
internal generator regulator. The circuit allows the generator to operate
properly even if the battery charge indicator bulb fails.
| • | The conductor type is stainless steel core Cross-Linked Polyethylene
Elastomer (XLPE) resistance wire. |
| • | The insulation is white and has black printing that reads "XLPE
RESISTANCE - DO NOT CUT". |
| • | The wire size is 0.22 mm² (AWG Size 24 gauge). |
| • | The wire has a stainless steel core and provides a resistance
of 6.591ohms (±0.330ohms) per meter (39.4 in). |
| • | The wire length is 303.5 cm (119.6 in). |
| • | The wire provides a resistance of 20ohms (±2ohms). |
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