Battery charging issues hopefully solved.

[marc]

Last winter my Sussie was having some battery charging issue. I could read only 12,3V between battery terminals, and these volts went down to 11,9 when I revved the bike beyond 5K.

Replaced battery and regulator (used Shindengen SH640EA), the issue was not solved but did the job during summer time. Now in winter the bike dies again :-(

So I simply followed the schematic and made the testing:

- Continuity test in coils: OK
- Started engine, revved to 5K: coils were giving 65Volts each. A little bit in the down side, but OK after all.
- Plugged the regulator. I could read 14,6V at the output. Revveing the engine it went down to 14,2 but of course, this is no problem: the battery needs 13,8V to charge and little peaks of 14,4V to remove sulfatation.
- Checked voltage at the battery terminals: 12,3V and down to 11,9.
- There are 2,3 volts hiding somewhere.

The electric schematic is very simple: from the regulator to the battery there is only:
- The regulator faston
- The starter relay faston
- The fuse.
- The battery terminals.

So I grabbed my preferred contact cleaner spray and a steel brush and did a cleaning job to all these terminals. The fuse came out with very dirty and corroded terminals.

After the cleaning I could read at the battery terminals 14,6 - 14,7 Volts.

Problem Solved. 



Old '90 sussie with 105.000Km on it.

[The_Paragon]

Good for you man! Electrical can be a nightmare!

I once had an '86 FZ600, kept burning up charging rotors, 3 of them, replaced stator, R/R, Hunted for a LONG LONG time and invested $$$$ to figure this thing out. Finally came to the conclusion that the previous over put 2 60/55 watt headlight bulbs in, reather than the 35/35 watt bulbs it was supposed to have... 

None the less, electrical issues leave a sour taste in this kid's mouth!!