RailKing GP-20 Diesel Engine
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The locomotive’s headlight is controlled by a constant voltage circuit in the engine. The
headlight is easy to remove and replace when it burns out. The bulb has a quick
disconnect plug that attaches the bulb harness to a connector terminal inside the body
shell. Replacement bulbs are available directly from the M.T.H. Parts Department.
Follow the body removal instructions found in the Lubrication and Greasing Instructions.
Gently disconnect the bulb harness from the socket on the constant voltage circuit or
connector terminal and replace the bulb.
The special NiCad 7-cell 8.4v self-charging battery recharges continuously during train
operation and should last for up to five years. The battery is a dry battery that should not
leak or cause any damage to your engine. Depending upon when your engine was built,
it may need to be charged right out of the box. If engine sounds seem distorted or
garbled at low voltages or become silent when power from the transformer is turned off,
test the battery to determine whether it should be recharged or replaced.
Test:
Put the engine in neutral and leave the track voltage at 10-12 volts (high enough
for the lights to shine brightly and the engine to move steadily) for 15 minutes.
Replaceable Lights
Figure 7: Removing The Replaceable Lights
Headlight Replacement Instructions
Self Charging Battery Back-Up
