5000 Gen Light

tom cullom · Feb 3, 2014

I just installed an new Gen and voltage reg on a 5000 ford tractor someone had cobbled on a alt with no tach drive. I wanted more original.

The problem is at idle the gen light is off when increasing the rpm the light comes on and gets brighter. something is hooked up wrong but not sure where to start looking.

All the wiring harness ends were cut off but i found a diagram to re wire it I think all is what it is suppose to be

JMOR · Feb 3, 2014

(quoted from post at 21:31:29 02/03/14) I just installed an new Gen and voltage reg on a 5000 ford tractor someone had cobbled on a alt with no tach drive. I wanted more original.

The problem is at idle the gen light is off when increasing the rpm the light comes on and gets brighter. something is hooked up wrong but not sure where to start looking.

All the wiring harness ends were cut off but i found a diagram to re wire it I think all is what it is suppose to be

om, I don't have a 5000 schematic (unless same as 4000?), but all gen warning lamps that I have ever seen on generators had their 2 leads, with one to ARM (dynamo) and the other to the switched side of ignition switch.

John T · Feb 4, 2014

I don"t have that schematic either, but similar to JMOR on some/many tractors a typical idiot charge indicator lamp is wired basically across the Voltage Regulator"s Cutout Relay, one lead eventually to BAT (say an ign switched source that"s hot via the BAT terminal when key/switch is turned on) with the other lead to GEN/ARM on the VR. If the genny isn"t charging the light gets a ground via the gennys armature so it lights up. If the genny is charging the voltage is same across the light (cutout relay is closed) so it goes out.

Heres my Troubleshooting Procedure for non charging HOWEVER this is for a Class A System, some Fords used a class B but I think that was just a few of the older ones??????????

John T
John Ts Class A Troubleshooting

JMOR · Feb 4, 2014

(quoted from post at 10:04:07 02/04/14) I don"t have that schematic either, but similar to JMOR on some/many tractors a typical idiot charge indicator lamp is wired basically across the Voltage Regulator"s Cutout Relay, one lead eventually to BAT (say an ign switched source that"s hot via the BAT terminal when key/switch is turned on) with the other lead to GEN/ARM on the VR. If the genny isn"t charging the light gets a ground via the gennys armature so it lights up. If the genny is charging the voltage is same across the light (cutout relay is closed) so it goes out.

Heres my Troubleshooting Procedure for non charging HOWEVER this is for a Class A System, some Fords used a class B but I think that was just a few of the older ones??????????

John T
John Ts Class A Troubleshooting

ot high on the "important" list, but since I know, I will say that the very first few (~12500) 9Ns used a regulator & a "B"-ckt gen/VR (externally sourced field) then from that point up until the 8N they used an internally sourced field with a cut out.
Beginning with the 8N, they used a "A"-ckt gen/VR (internally sourced field). Then with the 1953 NAA (jubilee), they went to the "B"-ckt (externally sourced field) and continued that arrangement until the alternators replaced the generators. About as goofy as Model Ts having Neg ground then going to POS ground until 1956 and then back to Neg ground (automobiles).??
:lol:

John T · Feb 5, 2014

Thanks, I knew some Fords (and some Massey Harris I think??) used Class B but I had no idea which ones therefore the warning on my Troubleshooting.

John T

souNdguy · Feb 6, 2014

probably more correct to say MOST fordtractors used B circuit. as only 8n used A circuit.

5000 Gen Light

tom cullom

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JMOR

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John T

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JMOR

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John T

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souNdguy

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