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Too much electricity!!!

Submitted by harry_atkinson on Sun, 30/10/2016
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Electrical

After a lifetime of 'battery conservation', I now find having gone all LED, that event with all lights blazing, I am over charging. What is the best fix for this? Can I not connect one of the alternator output wires? Do I need some kind of resistance in the circuit?

Help please!!

Submitted by john_holmes on Sun, 30/10/2016

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Get a regulator/rectifier that can handle more watts, you can get 200W capacity ones for Honda's for peanuts.

Submitted by harry_atkinson on Sun, 30/10/2016

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Previously john_holmes wrote:

Get a regulator/rectifier that can handle more watts, you can get 200W capacity ones for Honda's for peanuts.

I should have said more. There are two bikes concerned. Both are six volt. One coil ignition and one magneto. Both are positive earth and wired as per the Norton manual.

Submitted by john_holmes on Sun, 30/10/2016

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There are 6v zeners around nowadays for scooters , or convert to 12v and regulate. Conversion is cheap as your alternator is unchanged as long as the LEDs can take 12V, the ones I use on my Commando work down to 5V which is their internal voltage behind the integrated voltage regulator inside them.

Submitted by les_howard on Mon, 31/10/2016

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The first thing to try Harry is to disconnect the "High Power" set of coils from charging the circuit. Assuming you have a standard Lucas Rm 13-15 alternator you are likely to have 3x wires that are connected to the wiring loom near the chain-case with a 3 way bullet connector.

You need to remove the GREEN/YELLOW (alternator side) wire from the connector and insulate the end either with tape or simply slipping the bullet into one end of a single bullet connector to insulate it.

This will leave the common wire (white/green) and low power (green black) still feeding the rectifier. Try this as it costs nothing and can be done in seconds.

If the battery still overcharges, fit a 6V Zener diode made for the job it should fully clip the output at around 7.2V to fully charge the 6V battery.

Les

Submitted by gordon_johnston on Mon, 31/10/2016

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You could always use a power sink - say a high resistance bit of tungsten in an evacuated glass sphere - and use the resultant bright glow to illuminate your progress as you ride along. Perhaps I should patent the idea.

Submitted by harry_atkinson on Mon, 31/10/2016

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Previously les_howard wrote:

The first thing to try Harry is to disconnect the "High Power" set of coils from charging the circuit. Assuming you have a standard Lucas Rm 13-15 alternator you are likely to have 3x wires that are connected to the wiring loom near the chain-case with a 3 way bullet connector.

You need to remove the GREEN/YELLOW (alternator side) wire from the connector and insulate the end either with tape or simply slipping the bullet into one end of a single bullet connector to insulate it.

This will leave the common wire (white/green) and low power (green black) still feeding the rectifier. Try this as it costs nothing and can be done in seconds.

If the battery still overcharges, fit a 6V Zener diode made for the job it should fully clip the output at around 7.2V to fully charge the 6V battery.

Les

Thanks for all of the suggestions above. I will try the wiring mod of disconnecting the green/yellow from the alternator, as this sounds the easiest thing to do without radical alterations to the electrics. If it then under charges, can I substitue the green/black wire instead for isolation?

 


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