Regulator / rectifier issue on 2005 Sprint ST 1050

dylb · Aug 31, 2015

Hi,

I bought my Triumph Sprint ST 1050 in Feb 2015 for £2400. It is a 2005 model with quite a few miles on the clock (80,000). I mentioned the high mileage when buying it but was shown the full service history and was reassured that it was a good bike with no issues.

A month later the battery died so I replaced it. There were some issues with the clutch (it had the wrong length clutch cable fitted). This was fixed under the 3 month warranty that the bike came with and I was told the bike had been serviced.

In August I broke down with a flat battery and had the regulator / rectifier replaced at a garage closer to where I live. The alternator was checked and found to be OK. After being back on the bike for a day and a half I broke down again. The alternator had 3 scorch marks so I had that replaced. I did 14 miles on the bike before breaking down again with a flat battery. The regulator / rectifier seemed to have overheated and melted black gunk. It is now back at the shop being looked at.

I am at a bit of a loss as to what to do and what is causing all these issues with the regulator / rectifier. I have spent around £900 so far. All replacement parts have been from Triumph. Love the bike when it's running no so keen on having to call the AA each time I ride. It's my daily commuter and I use it for longer trips visiting friends and family.

Should I keep spending or cut my losses? Has anyone ever had similar issues?

Any advice much appreciated.

Thanks

Bindie · Aug 31, 2015

try elecrtosport.com, go to diagnosis centre then fault finding guide, gives a flow chart for charging problems

stevethegoolie · Aug 31, 2015

www.electrexworld.co.uk

Probably too late, but genuine Triumph parts are priced by Dick Turpin to maximise urine extraction!!

Used the above when my stator and reg/rec died (2002 Daytona 955i CE) and had them supplied and fitted by a Triumph dealer for much less than the price of the gen Triumph parts on their own!

Robin Sanderson · Sep 3, 2015

There is a mod which can be made to most reg/recs to make sure they work properly. There are lots of articles about it including in a recent mcn. It revolves around making the earth go straight to the negative of the battery rather than an earth point which might fail. If the reg can't discharge the excess charge to neg/earth throughout the Rev range then it quickly cooks it.