Alternator

[Pete D]

Chaps

First run to work since Christmas........and the battery light remains on....

Alternator belt fine, so guess it is either the regulator or alternator itself; the bike has heated grips etc, so would guess it has the 50A alternator (albeit, it looks like the 40A one on the Motorworks site). Is there a quick way to check and, in the likely event that the alternator has 'gone west', have any of you a spare one hanging around at the back of the garage that you want rid of?

Bike is an 02 1150GS

Cheers

Pete

 

[NeilDD]

Pete,
Check the blue wire on the back of the alternator.
This feeds the charge light.

Its not unknown for the wire to corode thru'

HTH
Neil

 

[Pete D]

Good call....I'll check it...and report back...


Alas......no joy; blue wire, indeed all of the wires in good condition, connections cleaned.......and same symptom....

 

[Lord Snooty]

Could it be the alternator brushes? I've got a similar problem with my K75S and I have removed the regulator/brush assembly and they are stuffed. They are a replaceable item on the K75 but not sure if they are on the GS.

 

[Pete D]

It could be.....I will have to wait to strip it down......unless a suitably priced replacement turns up......

On first start this morning, the bike did graunch a bit (rest of the motor is still silky-smooth even after 83k miles).....I rather hoped that the belt had snapped; unfortunately not......

Cheers

Pete

 

[fatnfast]

Check to see it the battery is being charged before pulling the alternator off. Meter across the battery with the engine running, 13.5 volts+ ?

 

[Pete D]

Good call.


Sent from my iPhone using Tapatalk

 

[Pete D]

Voltage across the battery with engine running.........12volts.....

Guess the new alternator will come in handy!

Pete

 

[warmshed]

Voltage across the battery with engine running.........12volts.....

Guess the new alternator will come in handy!

Pete

Check out the brushes first, then rectifier pack and the regulator. cheaper than a new alternator

 

[Pete D]

Got one off the Bay for £57 delivered.......I'll refurb the old possibly.....

 

[warmshed]

Got one off the Bay for £57 delivered.......I'll refurb the old possibly.....

Good option, you can take your time with the your old alternator, enjoy repairing it and have a spare.

 

[Ian J Hartley]

There is a good chance the regulator is toast.

Bosch part no 1197311233
BMW part no 12311739365

The cost for replacement regulators vary, Motorworks £40 plus. But if your not too picky, and on a tight budget these people
http://www.autospark.eu/voltage-regulators/bosch/vr-b200h-mobiletron
will supply an aftermarket alternative for about €9 plus postage. I've bought starter motor parts from them and can't complain on quality, price or service.