Delco-Remy Gen 1101355

Helllo. I have a Delco-Remy Generator for my 1945 Farmall A. It has the following number on it 1101355 and the tag is Red. It has the cut-out relay on top of the generator. Is this a 12 V Generator or 6 V. I want to keep it 6V. How can I tell the difference between 6 and 12V Thanks

That is the original # for tht gen for that tractor. Measure the voltage when it runs it should be 6v isnt the first time ive heard of a red tag on a 6v gen i have one myself but it does put out 6v.

Your battery will have 6 cells if its 12 volts.
Hal

[b:6fafea88e4]Red tag is 12 volt, black tag is 6 volt.

Bruce[/b:6fafea88e4]

Gene. Hello and thanks. Can I tell the voltage by looking at the brushes. If it has 3 brushes will it be 6 volt or did 12 have same brushes?

Generator number 1101355 is a 6 volt unit that IH used on the their tractors from the A through the W9. If it has a red tag it could be that when the tractor was repainted the tag was painted over and just the raised lettering had the paint wiped off of it. My guess would be that there is black paint under the red.

A six volt generator with a cut out switch connected with a 12 volt battery will output 12 volts if the rpms are high enough and the fields are grounded. If the cut out is set for six volts it most likely will not reopen when the tractor is shut off and will drain the battery. If you have a regulator connected in the same situation you may also see battery voltage on the A terminal of the generator. The normal position of the voltage regulator is to have the field coils grounded. When the generator spins up fast enough to create enough voltage the cutout contacts will close and you will have battery voltage connected through the regulator to the A terminal. The voltage control contacts will open but there will most likely be enough voltage at the cutout contacts to keep them closed when the engine is shut off, again draining the battery.

Brushes dont make any difference the third is adjustable for out-put. But yours will have three and can be adjusted by loosening the screw on the brush end and rotating that brush for Amperage out-put. If you are running the mag only need a couple amps and the hi-charge position on the sw will increase the amps more. If you are using a dist you will want about 3-4 amps as the mag doesent need any batt supply.

You can't tell the output by looking. You need to measure with a voltmeter.

Easiest place to do that is at the battery cables while the tractor is running.

If the tractor is not running, then you will have to wait until it is, or take the generator to an auto parts store and have it tested on their machine.

The voltage output of a generator is controlled externally.

If the generator is fitted with a cutout relay the voltage is controlled by the battery, the resistance in the field circuit, and the setting of the third brush.

If the generator uses a regulator the regulator controls the voltage output.

Just how do you set the cut-out for 6v you sound all mixed up with a cutout as they just connect the gen to the battery when the output of the gen is neough to close the points and when the genrpms go down to put out less than 6v the points open so the batt doesent drain.

A cutout does not control the voltage. Like you posted, it only serves a switch to connect the generator to the battery. It needs to close when voltage gets over battery voltage and open again in the charging voltage drops below that level. The battery, by absorbing the amperage coming from the generator, serves to limit the maximum voltage on the output side. The position of the third brush determines the current available to the field coils. The external resistors at either the cut out or the light switch controls how much of this available current flows through the field coils.

If you take a 6 volt generator with cut out and install a 12 volt battery the cut out relay will close when the voltage output from the generator reaches the cut in level. Until the voltage level reaches the voltage of the battery there is no effective resistance from the battery and the voltage will continue to rise until above battery voltage. Once the voltage goes above battery voltage the voltage will stabilize when the total amperage out put is absorbed by the battery.

At that point the 6 volt generator can actually be charging the 12 volt battery. The problems comes when the generator output drops off. Since the cut out is adjusted for a 6 volt battery it does not open when the output drops below battery voltage. Instead current will flow back into the generator. Since the voltage drop back through the armature is usually not enough the drop the voltage at the cut out below the level where the switch will open the contacts will remain closed and drain the battery.

A 6 volt regulator system will not charge a 12 volt battery because once the upper voltage limit is reached the field control contacts will open. Depending on how the cut out contacts are wired in the regulator the may or may not open when the engine is shut off.