Scooterotica

Hi,

I'm building a DC system using a Wassell regulator/rectifier, so I have wired the four lighting coils together and run a yellow wire from each end of the series. When I run the scooter, I get a rather poor 4.5v AC out of the two yellows and no increase in output with a rise in revs.

Now what I have done is not so different to most AC systems, it is just that output on AC systems is measured between the one yellow and earth. However, output on such a system usually rises to 16-18v without many revs.

I have checked the resistance on three stators (a Vespa stator, an Indian stator and my new stator) and the readings are not consistent.

What should the resistance of the 4 lighting coils be? Can someone take 5 minutes to measure between their yellow wire from the stator, and earth? You don't even need to start the engine. The more replies I get, the better.

Thanks in advance

I have got it sussed.

I was reading the AC voltage output from the two yellows while they were connected to the Wassell regulator/rectifier, and got 4.5v. When I disconnected them from the Wassell, I got a healthy 18-19volts output from the stator. Odd.

I have now checked the system on the rectified side of the Wassell (which perhaps I should have done before I posted) and I can see the DC circuit is provided with a healthy 14.7volts at tickver; enough to keep the battery charged. When I kill the ignition, this drops to 13.4volts, which is correct for a battery "at rest".

It all looks promising. You can see why people rave about this conversion. OK, you add a battery to the circuit, but all the other advantages seem positive (pun intended).

PS. The resistance on 3 different stators was between 0.7 and 0.9, and I have now decided that one of the Vespa stators is faulty, hence mad readings. The main thing is that the output is good.

Knowledge wrote:Hi,

I'm building a DC system using a Wassell regulator/rectifier, so I have wired the four lighting coils together and run a yellow wire from each end of the series. When I run the scooter, I get a rather poor 4.5v AC out of the two yellows and no increase in output with a rise in revs.

I take it that the 4.5v reading was taken without any load on the stator? This shows why this system ideally needs a battery or capacitor to load the system to relieve pressure on the reg and the stator itself.

Curiously, it was the other way around. When the stator was connected to the rest of the loom, I was able to read only 4.5v across the two output yellows from the stator. When I disconnected it, I measured 18v across them.

I reconnected and measured the output from the regulator, and got good DC power. It still reads 4.5v on the input side but I never claimed to understand the world of electrickery.

However, I have checked my ohmeter, and it isn't reading correctly, so please ignore the resistance figures I quoted earlier in this thread.