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Amp Output for A Bosch Magneto?
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Amp Output for A Bosch Magneto?
Say what? That must be wrong; I seem to recall it putting out about 5-7 amps. Anybody know the correct amperage output?
-B
- schrader7032
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I'm probably out of my depth
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
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Whew! Nice to see that senile
Now, I know that the battery puts out something like 5 ampers. But that doesn't mean that the mag itself does. Looks like we're both waiting for the more acurate answer.
The real question is if I'll be OK on the output or do I return it to my mag guy?
-B
- schrader7032
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I wouldn't know how to
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
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Yup, you got that right.
These prewar electrical systems are sorta famous for it. The system charges just fine on the highway or above about 3500rpm. But putting around town-from stoplight to stoplight-will drain the battery and kill the headlight in around 15 minutes. I've learned to drive at night by just using my parking light.
Time to install a fancy-pants LED set-up...
-B
dynamo output
- the dynamo works perfect. I use a 35W bulb and a new battery for appliance and check the rest of Ampere, approx 3A is coming out in warm condition.
On that basis your 2.5A sounds marginally down but not enough to bother about.
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Its an R11. As far as I know,
What do the rest of you think? Is that 3 ampers rating about the same for everyone?
-B
- caker
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Make way:
Are we talking about the generator output? If so, 2.5A @ 6V is only 15W and will likely be insufficient to charge the battery when loaded with the headlight. The ignition load is handled by the magneto itself, so there is no worry about the bike not running even with a weak generator.
If they were talking about the actual magneto portion - I'm not sure how that would be measured and what the voltage would be. But, I don't believe amperage if/when measured on the primary coil is significant. It's the secondary coil output that matters as far as what will actually be at the spark plugs. The secondary coil ups the volts into the tens of thousands but reduces current to the milliamps.
-Chris
It takes 1 volt to push 1 amp
OHMS Law
92 R100RT/69 R69S
2004 Aprilia Atlantic 500cc single cylinder Scooter
83 Honda V65 Magna, fastest production bike in1983
2015 Can Am Spider SE6 1,688 miles
2018 Moto Guzzi V711 Special
dynamo output
Are we talking about the generator output? If so, 2.5A @ 6V is only 15W and will likely be insufficient to charge the battery when loaded with the headlight.
-Chris
Re-reading what Wolfgang has put I think my earlier statement was wrong and Chris is right. Wolfgang said that he tested the output whilst a 35 watt bulb was in the circuit. This would simulate the output when being driven at night ( less, of course, the slight draw from the rear bulb). So with the lights on there should still be roughly 3 Amp of power available to charge the battery