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# Thread: Simple Workings of a Transformer

1. ## Simple Workings of a Transformer

I ordered a 115 volt primary, 12 volt secondary transformer. I received it and this is my problem: Has 2 wires for primary got that, has 2 red wires and one white wire on the secondary. When I connect to 115v and check the secondary Ground to white and check each red wire I have 7.5 volts out of each read wire. I need 12 volts, am I missing something? Why does it have 2 red wires? How do I get the 12 volts I need?

2. Whatever you are calling ground does not enter this equation.

Without actually seeing a diagram of that unit, I would suggest that the secondary is the two red wires. You would see about 15 volts ( open circuit). That is about normal to give you 12 volts under load. The white wire is the center tap, hence 1/2 the voltage from each red to the white.

3. ## Transformer

It has 2 black wires on the primary side. One white and two reds on the secondary side. If I connect meter: One leg to the white and one to either red I get 7.5 volts. How do I connect it to get 12 volts? I need it to connect to a govenor control box on a generator. I have two connections on the control box to connect the transformer too. The govenor control needs 12 volts to operate.

Thanks
DJ

4. ## voltage

is there any voltage between the two red wires?

5. Originally Posted by DJhandy
I ordered a 115 volt primary, 12 volt secondary transformer. I received it and this is my problem: Has 2 wires for primary got that, has 2 red wires and one white wire on the secondary. When I connect to 115v and check the secondary Ground to white and check each red wire I have 7.5 volts out of each read wire. I need 12 volts, am I missing something? Why does it have 2 red wires? How do I get the 12 volts I need?

What brand and model so we can look it up online...

6. Measure between the two red wires, tape off the white wire unless you have a need for half the voltage.

7. I need it to connect to a govenor control box on a generator. I have two connections on the control box to connect the transformer too. The govenor control needs 12 volts to operate.
A transformer will output AC voltage. Are you sure that your application does not require DC?

8. ## Transformer

Yes I need 12 volt AC it is a replacement transformer. The old one had various voltages 6-9-12 I believe and the 12 was used. The model# 41FG300 is what was sent(no name or origin) as replacement and it states Pri: 115v Sec: 12.6 v
It supplies the signal to the governors board from the generator to control the engine speed. The wires from the transformer goes to a ground terminal and to signal in on governors board. The replacement transformer as stated previously has 2 black wires for primary, secondary has 2 red and one white wire. Power across both reds are 14-15 volts, from either red to white is 7.5 volts. I need 12 volts from single wire to connect to board and a ground wire to board. I've always used transformers that gave me the voltage I needed out of one wire. What do I need to accomplish what I seek?

9. first:
there is no such animal, you need two wires (paths), to make a complete circuit,

even a cars coil, (which is a transformer) is actually a two wire (paths) unit, the high voltage wire running to the spark plugs and the case of the coil which attaches to the bock of the motor and the spark plugs are also attached to the block of the motor, thus two wires even tho you only have (one visible wire) in other words there needs to be a complete circuit, which takes two avenues of path, (wires),

there is two wires,(paths) in the primary side of the transformer, and there are two or more paths, (depending on the taps) on the secondary side of the transformer), but each voltage needs a complete circuit to travel thus (for sake of better description) a path out of the transformer coil and one back in to coil. Now like in the cars coil the case of the coil is the other path (wire),

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two: apparently the transformer you have is different than the one that is in the generator, and you may need to go and get actual parts for that model

three: it sounds like to me you may be wise to take it to a an actual repair place that understands the workings of the generator and get fixed and checked out by some one who understands what is going on in the unit,

if you get it hooked up wrong you may end up costing your self much more than the price of the transformer,

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