few weeks ago the (new) battery of my 1978 GS1000 didn't charge anymore. I did posplayr's quicktest to verify, then checked the diodes of the rectifier and found that one of them was dead. As a replacement I tried to get an SH775 (as recommended here in the forum) but they seem to be hardly available in Europe (maybe the lack of Polaris snowmobiles?), the few ebay ones don't seem genuine to me.
I tried silent hektik but they apparently change their products at the moment, so it would have taken at least 4 weeks to get something delivered.
Looking at the list of r/r here in the forum I bought a used SH232-12V from a Honda CB400 shipped from Germany for 25€. With the help of BikeCliff's documents I got all the connectors replaced to fit the GS.
IMG-20170914-WA0001.jpg
So today was the day of putting it on the bike! Everything went well, the battery seems to be charging. Results of the quicktest are:
Quick Test Steps:
1.) key off................Normal 12.7 volts-12.9 volts 12.7 V
2.) key on (but not cranking with lights for 10 sec).....Normal 12.2-12.5 volts 12.5 V
3.) at idle (1500 rpm).....12.6volts - 13.2volts 14.3 V
4.) at 2500 rpm 13.5 -14.0 volts 14.3 V
5.) at 5000 rpm.....14.0 -15.0 volts 14.3 V
6.) key off.....slightly higher than measurements # 1 (12.8-13.0 v) 12.8 V
At this point many thanks for the great guidance (documentation) in finding the issue (posplayr) and fixing it (BikeCliff)!!!
So it seems to be charging, which gave me a first feel of relaxation At second thought (and re-doing the quick test), the charging curve seems a bit steep to me. It only goes below 14V at rpm lower than 1000 (idle speed is ~1500), I measured approx. 13.8V @ 1000 rpm.
The SH232 has a sense wire that I attached to the rear brake light wire (green-orange one). Between that and battery - I measured only 11.9V, while measuring the battery was about 12.7V. So I guess the sense wire makes the voltage go up.
However, as my experience and knowledge is limited I guess there are some people here that can tell me if this is nonsense or not.
Is 14.3V starting >1000rpm something to worry about?
Thanks for your insights
Juergen
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