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Gremlins in the electrics

Submitted by alan_houghton on Wed, 08/05/2013
Forums
Electrical

Okay Al,

The bike is a model 88 on 12volts ,and the battery isnot gettin charged; the wiring is all new and on a static test with a full battery,start the bike ,disconect the stator

cross the 2wires with a bulb and I`m not getting a light,the test for continuity is ok.So it looks like the rotor has had it, am I correct in my presumtion.If I need a new rotor

what serial number should I be looking for.Any advise wil be gratefully recieved.

Alan H.

Submitted by tony_ripley on Wed, 08/05/2013

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Hi Alan,

How are you testing the continuity ? What is the resistance ?

Even a weak rotor will provide enough volts to get some light. My standard rotor test is to use a 1/4 inch bar (screwdriver) and see if the magnatism is enough to support it's own weight. Can you try this ?

Regards

Tony

Submitted by alan_houghton on Thu, 09/05/2013

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Thanks Tony,

I`m at an early stage of my investigation so the rotor is stil on the machine,it looks like I`m just gonna have to get oily handsand have the primary apart"again."Oh how I hate these Sparky Gremlins.

Cheers,

Alan H.

Submitted by alan_houghton on Thu, 09/05/2013

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Ok Tony,

It looks like it`s sorted,the rotor has plenty of magnetrisity so I foundan old knackered stator from my reject bin, it pays not throw stuff out Eh! it`s 3 wires must have shorted where they come out of the epoxy, causethe hardened plastic insulation cracked etc.Once I`ve dug the cables out of the resin and joined 2of the wires together,pot luck here as which wiresI choseas no colour codeing on burnt wires. New lengths of green/yellow,white/green soldered on andtempory bolted back on the bike,bulb and wires attached acrossthe stator.I then kicked the bike into life,and low and behold illumination,sothere`s nowjuice comin thru and hopefully no more flat batteries.Imust alsosay Ta! to Al Osborne,the fault was found using your info.

Thanks Guys,

Alan H.

Submitted by simon_ratcliff on Fri, 10/05/2013

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Vehicle Wiring Products do heat resistant sleeving which protects upto 155 degrees C and unaffected by oil and petrol, perfect for alternator leads!

Submitted by alan_osborn on Tue, 04/06/2013

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Previously alan_houghton wrote:

Ok Tony,

It looks like it`s sorted,the rotor has plenty of magnetrisity so I foundan old knackered stator from my reject bin, it pays not throw stuff out Eh! it`s 3 wires must have shorted where they come out of the epoxy, causethe hardened plastic insulation cracked etc.Once I`ve dug the cables out of the resin and joined 2of the wires together,pot luck here as which wiresI choseas no colour codeing on burnt wires. New lengths of green/yellow,white/green soldered on andtempory bolted back on the bike,bulb and wires attached acrossthe stator.I then kicked the bike into life,and low and behold illumination,sothere`s nowjuice comin thru and hopefully no more flat batteries.Imust alsosay Ta! to Al Osborne,the fault was found using your info.

Thanks Guys,

Alan H.

PS The name is OSBORN. Glad to be of assistance. Mostly alternators go 'open circuit' very rare they go short circuit as above. Just remember test with a lamp across the alt. and to earth. Don't bother using a meter.

Magnetrisity!!?? can I patent that word? Magic!

Now two wire stators-there is no difference with the wire/colours. Three wire stators (RM19 for 6 volt) have High-GRN/YLW and a Low GRN/BLK and a common WHT/GRN. if the Low and High are connected together it becomes a two wire as per RM21 and there is no difference between the two wire that now feed the rectifier or regulator/rectifier.

Al Oz

 


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