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john deere 4010 24v system gen light

T

tkaiser

New User
The gen light on my 4010 24v system does not come on when the switch is turned on. I moved the connector housing and the lamp to the oil pressure light side and turn the switch on and the pigtail harness with the connector housing and lamp work. Why do I not get the gen light to turn on when it is connected to the correct place on the instrument panel. I check all the wires and they all look good. Can it be the voltage regulator? Is there a point connection that is made inside the voltage regulator that is engaged which turns the gen light on until the generator produces voltage and then the contact point for the gen light opens and turns the gen light off.
 
There's NO special terminal or internal mechanism at the VR to operate the light.

One side is connected to the GEN/A1 terminal on the voltage regulator, the other is connected to a special terminal (with resistor) at the key switch labelled "GEN".

With switch "ON", GEN terminal at key switch should be close to zero Volts with respect to the chassis IF the warning light is lit, will be at (-)12 Volts (nominal) if the lamp or it's circuit are "open".

It's possible the (+)12 and (-)12 Volt battery cables have been mixed up, or the wiring front the starter to the key switch has been mixed up.

As it left the factory, the terminal on the side of the starter "belly" should measure (+)12 Volts (nominal) to the chassis, and the highest-up terminal on the starter solenoid with a battery cable connected to it should be at (-)12 Volts (nominal) to the chassis. The BLUE wire that runs up to the key switch connects there, as well, taking (-)12 battery current to the switch.
 
Thanks, I forgot to mention that it was working but now it does not. I am going to check the wire and connector and voltage at the key switch like you suggested. Possible poor connection. all the wires from the gen light to the vr all look good and clean. I will also check the wire at the starter.
 
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