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alternator energizing bulb wattage

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Ali View Drop Down
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    Posted: 11 Mar 2019 at 15:50
Hi all getting to the last part of rebuilding my mk2 v50, I am having trouble with the charging, I have tested the alternator stator and rotor and all tests ok there I have also tested the diode board and all is well just the regulator now, my question is I have a 1.2 watt bulb fitted in the alternator light reading the bmw R system (which is the same as my guzzi) had a 4 watt bulb fitted as it energizes the rotor magnet and charges at a much lower rpm, I now believe that the 1.2 watt I have is to much of a resistor to energize the rotor properly, I cant find a bulb of this size to fit the dash bulb holder the biggest I can find is 2.3 watt, Am I correct in this thinking or barking up the wrong tree, thanks all re Alistair   
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Brian UK View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2019 at 16:26
I thought the normal size was a 2.2W bulb. Never seen anything higher fitted before. Certainly a little more current flowing will help the lower RPM start up.
Brian.

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Ali View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ali Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2019 at 16:51
Cheers for the info, gets a bit baffling reading things on the internet
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Mike H View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2019 at 18:47
All the ones I saw (including literature) were 1.2 Watts. What kind of regulator is it?




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Brian UK View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2019 at 19:57
I know 1.2W is commonly specified for the Bosch alternators on BMW and Guzzi. But all others specify minimum of 2.2W.
Brian.

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Ali View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ali Quote  Post ReplyReply Direct Link To This Post Posted: 12 Mar 2019 at 07:50
bosch system cheers
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Ken-Guzzibear View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 12 Mar 2019 at 11:43
The Bosch CWL 1.2 v ..... you can pop 2.2v in the others 

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