voltage regulator bench test?

bad monkey · Mar 9, 2016

Trying to figure out why my TO20 isn't charging. It is still a 6 volt. I grounded the field and got 21.6 volts from the genorator. Long story short I checked wiring and it all seems ok. Is there away to bench test the voltage regulator?

teddy52food · Mar 9, 2016

If the voltage is that high, the cut-out is not closing to let the amps go to the battery.

bad monkey · Mar 9, 2016

(quoted from post at 21:13:26 03/09/16) If the voltage is that high, the cut-out is not closing to let the amps go to the battery.

When I got over 20 volts the genorator wasn't hooked up.to the rest of the tractor and was straight off the genorator with the field jumped to ground. With the genorator wired to the rest of the tractor I get 3.5 volts.

pcsaw · Mar 10, 2016

This is what your not suppose to do but if u take
the cover off n take a screwdriver n very carefuly
push in on the points one at a time n see if it makes
the gauge show that it is charging then u know that
the voltage regular isn't working correctly now some
people know how to adjust the points n file the
points but I've never had any luck with that n it
seems that the regulators from Napa don't seem to
last very long on my friends tractor but the next time
it goes out I'm taking the generator n regulator to a
shop that is really good n have them make sure
there is nothing from the generator causing the
problem regulators have doubled in price in the last
ten yrs

teddy52food · Mar 10, 2016

Are you using a digital gauge or a good one with a needle?

bad monkey · Mar 10, 2016

(quoted from post at 07:28:13 03/10/16) Are you using a digital gauge or a good one with a needle?

All I have is a digital.

bad monkey · Mar 10, 2016

(quoted from post at 07:28:13 03/10/16) Are you using a digital gauge or a good one with a needle?

All I have is a digital.

glennster · Mar 10, 2016

on the delco regulator you can run a jumper wire from the bat terminal on the regulator to the arm terminal, start the engine and see if it charges, this bypasses the regulator.. if the ammeter shows charge the regulator is bad. you can also ground the field on the genny with the v-reg still jumped and see if that charges. if it doesnt charge , you prolly have wiring problems somewhere.

John B. · Mar 10, 2016

The regulator needs a good ground connection to the frame so it can ground out the Field in the generator. It sounds like your generator is
good. Now you have to take it one step at a time to see where the current isn't getting thru to the battery. If it were mine I would take the
cover off the regulator, hook my volt meter up to the "A" terminal on the generator and ground the other meter lead, then close the points in the regulator and you should read battery voltage. If no reading then the voltage regulator is defective.

John T · Mar 11, 2016

One way to by pass the VR functions *(for a Class A system) to see if it then charges when running is to"

Use a jumper to dead ground the VR's FLD terminal to see if it charges then when running??? This forces the genny to its high max charge condition. If it charges with FLD grounded but NOT otherwise, the VR is bad or it isn't well grounded VR NEEDS A GOOD GROUND TO WORK

If still no charge when running with FLD grounded, by pass the VR's Cutout Relay by jumping BAT terminal over to GEN/ARM terminal. If it charges then the Cutout Relay is bad or the VR isnt well grounded

If no charge with VR by passed (Fld grounded and BAT connected to GEN/ARM) and all else is okay the genny itself may be bad as the VR is basically out of the equation at that time.

Run my Charging Troubleshooting Procedure for more help

John T
John Ts Charging Troubleshooting

55 50 Ron · Mar 11, 2016

Nothing wrong with a quality digital multimeter. Trouble is that there are digitals that give "bad names" to all digitals.

teddy52food · Mar 11, 2016

I have never had much luck with them where there is a lot of electric noise, but I never had an expensive one either. I still trust the needle.

souNdguy · Mar 15, 2016

it's all timing..

slow sample rate vs fast sample rate... better meters.. faster sample rates.

voltage regulator bench test?

bad monkey

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bad monkey

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pcsaw

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bad monkey

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