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Tiger Workshop (archive) Shop Talk, Ideas, Hints, and Tips for smooth running for the 885 - 885i - 955i & 1050i Tigers (Threads in this sub-forum will be progressively moved to their relevant model sub-forum)

 
 
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Old 12-21-2007, 09:25 PM   #1 (permalink)
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How to check alternator on '95 Tiger

I've had a defective charging system for the past few months on my '95 Tiger with ~ 62K miles on it - fairly common symptoms - voltage starts off around 12 vdc and steadily decreases as the engine runs - to the point that it dies a little under 8 vdc. Put a new battery in - same issue. I've got both the factory service manual as well as the Haynes. The factory one sez very little about troubleshooting the charging system. The Haynes gives a few tests to try - mostly checking the regulator - based on my results, I went ahead & rolled the dice and ordered a new one - appears to be backordered. I've checked the rotor and it's good - next obvious step would be to check the stator, but due to the way the 3 leads tie directly into the rectifier board, I'm uncertain & leary to do so - anyone have a suggestion for this? I've already checked all connections - appear to be good. Thanks!
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Old 12-22-2007, 09:26 AM   #2 (permalink)
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This is an excellent fault-finding process which should help...
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Old 12-22-2007, 03:35 PM   #3 (permalink)
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Ian -

Thanks for the link - however, someone else had forwarded it some weeks ago to me - spent a few hours trying to decipher it - came to the conclusion that there's just too many differences with my electrical system in comparison to what is shown for it to be a reliable, effective troubleshooting tool. While the Tiger has a Japanese charging system (Nippon-Denso, IIRC), the layout is different enough from what is shown - worried about shorting something else out and causing more issues!
Was hoping that someone on the forum had successfully tested the stator on a 94-98 Truimph and could specifically relay their technique.
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Old 01-15-2008, 04:03 AM   #4 (permalink)
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What you need is an oscilloscope. Check the wave output from the stator.
The charging on my 2001 Tiger (internal alternator no piggyback) failed a few weeks ago, and with only a multi-meter I was getting completely confusing info. All the readings of ohms from the startor said that all 3 phases were good.
5 seconds with a scop showe 15volts from 2 phases and 1 volt from the third.
Got a brand new alternator from these guys for 79 delivered... better than 325 from Triumph.

http://www.electrexworld.co.uk/erol.html#1290X0
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