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Old 10-10-07, 04:46 PM   #1
stooster
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Default is my alternator knackered???

hi all..

my sv650s w reg wouldnt start the other day...

charged battery and still wouldnt go...battery dropping down to 5 or 6 volts when starting up...

fitted new battery today and started well...so i ran through charging sytem checks and got the following..


leak test 0.2
battery = 12.7dcv
battery at idle (lights on full beam) = 12.3dcv
battery at 5000rpm (lights on full beam) = 12.2dcv

I thought my R/R was knackered but went on to check ac output of alternator...and only getting 23v across each of three wires

I assume the stator is knackered but i find it strange when i measure coil resistance of alternator all 3 measurments are 0.6 ohms and none of them are down to earth...

is this normal.....do i need to order a new stator or would it be repairable..

cheers for any help

stu
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Old 10-10-07, 05:40 PM   #2
Spanner Man
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Default Re: is my alternator knackered???

Good evening.

Did you do the alternator test at 5000 rpm? You should see around 75 volts. If you did test at 5000 rpm it's likely that you have a problem with the stator, despite getting continuity on the wires & having no continuity to earth.

If it tests ok at 5000 rpm it's probably the RR unit.

Cheers.
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Old 10-10-07, 05:48 PM   #3
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Default Re: is my alternator knackered???

Question: Why do we test at 5000 rpm?

Matt
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Old 10-10-07, 06:00 PM   #4
Spanner Man
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Default Re: is my alternator knackered???

Good evening.

A permanent magnet alternator such as the SV's will continue to pump out increasing AC voltage the higher it spins.
I think you'll find that if all is well with the charging system after 5000 rpm the regulator will start to errrr regulate, & start to lose the excess AC voltage as heat. Therefore if the alternator is to specification at 5000 rpm it is capapble of supplying the bikes demand.

Cheers.
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Old 10-10-07, 07:14 PM   #5
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Default Re: is my alternator knackered???

cheers for that spannerman.....was gonna strip down tomorrow but just measured it again at 5000 rpm and getting 80-90Vac...

retested the battery and got 13.2 at idle then 12.9 at 5000rpm so yes it seems my RR has gone....

whats my best option regarding replacement...

cheers

stu
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Old 10-10-07, 07:25 PM   #6
Biker Biggles
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Default Re: is my alternator knackered???

I put a Honda CBR600RR one in mine and it's spot on.
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Old 10-10-07, 07:58 PM   #7
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Default Re: is my alternator knackered???

Quote:
Originally Posted by Biker Biggles View Post
I put a Honda CBR600RR one in mine and it's spot on.
i read on here that they are suitable.....does the year matter........my local breaker just told me hes got a 1995 cbr600 that he is ready for stripping.....would this be suitable...

how much should i be looking at paying...

cheers

stu
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Old 10-10-07, 08:12 PM   #8
mister c
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Default Re: is my alternator knackered???

I used a GSXR one, it has been fine for the last few months. The unit is larger, but still sits under the bodywork fine. You may have to chop some wires & do some soldering, but it's dead easy.
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Old 10-10-07, 08:23 PM   #9
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Default Re: is my alternator knackered???

ok ..cheers for the advice fellas....the cbr RR will costr me 25 and im gonna try it on the bike first so sound like jobs a good un...

what do i need to do excactly to try this....ill solder it and make it all nice and insulated when i get it home but as a quick test if the plugs dont fit im hoping i can just use a couple of wires between plugs...

i know i have three wires from alternator to reg and 2 from reg to battery....is the cbr600 the same and if not what is it likely to have...

cheers for the responses so far..really helped me out here...not nice when your bike dont start is it...dont like getting the lammy wet
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Old 10-10-07, 08:58 PM   #10
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Default Re: is my alternator knackered???

I got a 2nd hand one from SV spares for 35 - which seems to work (since the weekend) - pain in the **** to fit into a pointy though
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