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Charging issue- help to narrow it down.

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Charging issue- help to narrow it down.
Started at 05:41pm on the 8th July, 2018 by Davedup
Davedup Subject: Charging issue- help to narrow it down.
Hi folks, I have an issue with my Super Meteor.
Actually broke down the way home following a club run. Have traced it down to not charging and not being enough power for the electronic ignition.
The bike has been converted to 12V, has a two wire rotor and is fitted with a Zenor diode. It also has a boyer power box and contactless ignition fitted by the previous owner.
If I run the bike off a battery charger (with battery still connected) it runs fine, as soon as I drop the battery charger it will not rev and eventually stops. Have connected a voltmeter across the two wires from the rotor and I'm getting 14-16v (is this about right?), across the battery without the charger is 12V which drops when revved (then she splutters and cuts out).
The zenor diode on its' mounting plate is getting very hot, even too hot to touch after less than 10 mins.
The rectifier seems to be kicking out the right Dc voltage.
Should the zenor get that hot so quickly? Where else can I check?
Any ideas?
Many thanks
Dave
Posted: 05:41pm 8th July, 2018
Davedup Subject: Charging issue- help to narrow it down.
Somehow posted twice, apologies
Posted: 05:45pm 8th July, 2018
Barry_Q Subject: Charging issue- help to narrow it down.
The zener diode is a simple, but brutal device. With your charging system, it's the first device I'd suspect. I'd pull the wire from the zener and run the engine with a voltmeter connected. If the voltage is higher than 12V, then the battery is obviously charging (An ammeter is equally valid). Then the zener is suspect.
Posted: 07:17pm 8th July, 2018
Davedup Subject: Charging issue- help to narrow it down.
Thanks Barry will give it a try
Dave
Posted: 07:46pm 8th July, 2018

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