Harris G80 Charging Voltage

Information related to the Harris Matchless (also known as Devon Matchless)
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Harris G80 Charging Voltage

Postby ianselva » Fri Aug 10, 2012 10:22 am

I've just had to renew the battery on my G80. The battery went totally dead whilst in the pub after a run. I started it with jump leads but it blew the headlight bulb on the way home and I wondered if it had cooked.
When I got it home I found the battery would not take any charge.
I have just fitted the new battery and checked the charging voltage and it goes up to 18V on a battery that was 14.7V to start with.
Does anyone have any how the voltage on an alternator charged motor should go ?

Thanks

Ian

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Harris G80 Charging Voltage

Postby dave16mct » Fri Aug 10, 2012 10:53 am

Reg/rec knackered?

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Harris G80 Charging Voltage

Postby ianselva » Fri Aug 10, 2012 5:28 pm

Thats what I suspect , I'd just like some confirmation. I have spoken to a couple of people about replacements. The first told me that measuring the voltage with a DVM was no good it would get interference from the engine and I needed a moving needle analog one to check the voltage , the other guy said they only made regulators for rotating magnet alternators as per Lucas

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Harris G80 Charging Voltage

Postby wilko » Sat Aug 11, 2012 12:00 am

So is yours an excited field alternator or permanent magnet? How many wires come out of the regulator

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Harris G80 Charging Voltage

Postby dave16mct » Sat Aug 11, 2012 8:32 am

www.electrexworld.co.uk/
Electrex make good reg/recs. Its just knowing which one is best for the Matchless. Dave

Edited by - dave16mct on 11 Aug 2012 08:34:57 AM

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Harris G80 Charging Voltage

Postby zagato » Sat Aug 11, 2012 11:07 am

Id say your Voltage Regulator is toast. Anything amiss with the battery will fry it, I blew one up by shorting the positive terminal to the frame with spanner, and another went when the battery collapsed. Get a proper one or you will be scratching your head figuring out how to use a universal one.

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Harris G80 Charging Voltage

Postby bjork » Sat Aug 11, 2012 1:38 pm

A digital meter should be fine for checking the electrics over. As said above, the rectifier/regulator unit sounds favourite here. Also agree that Electrexworld will be able to fix you up. If you know the wattage/amperage of the alternator and the number of wires leading from it it would be possible to adapt a rec/reg unit from some other model. As it's a Rotax engine some of the older Aprilia Pegaso/BMW F650's might be worth a look.They are relatively common too so that means more spares options available.
14.7volts should be the most you see when you run the engine, any more will damage other bits e.g. the headlamp bulb! that (maximum) figure is the same with lights on or off. Typically most similar bikes would net go quite so high on the voltage with the lights on, but anything over 12.5 (still not over 14.7!)volts with maximum load (i.e.lights on) is acceptable
Using yesterdays technology to create tomorrows problems today

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Harris G80 Charging Voltage

Postby ianselva » Wed Sep 05, 2012 1:19 pm

I agree that the regulator is kn**kered, but find the replacement is not so easy. The regulator on there is obsolete and even secondhand all the ones available are in France and seem to have a suffix on the part number. In spite of the schematic wiring diagram showing a 3 wire set up this doesn't appear to be the case, as checking I only seem to have two wires giving 18V+ AC and tracing the 3 wires from the alternator the third ones joins into a pair that disappear into the loom.
Has anyone successfully replaced the regulator on one of these ?
Ian

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Harris G80 Charging Voltage

Postby zagato » Fri Sep 07, 2012 12:44 pm

I got my last new one from B. J. Bikes & Bits triumph@britishmotorcycle.com.au , They get them from LF Harris as far as I know.

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Harris G80 Charging Voltage

Postby iandusud » Fri Sep 07, 2012 3:39 pm

I also vote for a knackered Reg /Rec and I highly recommend Electrexworld. Give them a ring and discuss your requirements. The guy there is very knowledgeble and helpful. Almost all modern reg/rec units are "Shunt" type and in my experience have about a 5 year service life. The ones supplied by Electrex world are, I believe the Mosfet type, which run much cooler and are much more reliable.

Ian

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