Bikes, Hints'n'Tips > Fazer 1000/FZ1 corner

A couple of electrics questions.

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robbo:
Having had a recent reg/rec failure, I’ve fitted a voltage display, taking the live from the side lamp wiring. My pals BMW S1000RR has a similar gadget which shows around 14.2 volts on tickover, whereas mine is around 13.3volts. What determines the voltage output to the battery. Is it the circuitry within the reg/rec, or the construction method of the stator/generator.
Secondly, on tickover, the voltmeter measurement across the battery is around 0.4/0.5 volt greater, than that shown on the display unit. If I place the unit across the battery again on tickover, the display matches the voltage that the voltmeter recorded. So the accuracy of the display unit is quite good. Is the loss due to the loom itself, plus the fact that the headlights would be on, as well as the neutral lamp and the HealTech gear indicator.
Thanks in advance folks.

b1k3rdude:
otherwise will correct me where I am wrong, but on the FZS1000 there was three electrical parts on the bike that can normally cause the Vdrop I, you and other's have experienced.
1. The connector that connects the alternator to the reg/rec isn't sealed from the elements and on a lot of bikes this gets corroded, this results in a small Vdroop due to resistance caused by the corrosion on the spade connectors.2. The red wire running from the reg/rec to the battery isn't of thick enough guage so again you get a small Vdroop across that small length of wire.
2. Most of the reg/rec's that were fitted the FZS were of average to ok quality. The reg/rec is a cheap shunt based unit, where as new bikes its a mosfet based.
Here is a thread on how to replace the connector and the battery charging wire -

- http://foc-u.co.uk/index.php?topic=4820.0
- and a video on how to change the reg/rec connector - https://youtu.be/sSo2AY6Nm5M

And here is a thread on the reg/reg as the similar unit was fitted to some Triumphs, with the Op recommending the Shindengen SH847 as it give you superior charging and reduced the load on the alternator at the same time -

- https://www.triumphrat.net/threads/charging-system-diagnostics-rectifier-regulator-upgrade.104504/- https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2060353.m570.l1313&_nkw=Shindengen+SH847+Series+R%2FR&_sacat=0

robbo:
Thanks very much for the link. Strangely enough I’d been considering a direct fused +ve lead from the reg/rec to the battery, as noted that the gauge of the reg/rec wire is thicker than the loom wire. Electrex World actually make a reg/rec with a metre long fused battery and earth wires to negate using the loom wiring back to the battery. They can be ordered without a plug thus allowing any fitment of your choice. That may well be the way to go. Thanks again, very helpful.

robbo:
Forgot to add, the white connector under the left hand side panel does seem to be in good condition, with no sign of any verdigris/corrosion/burning.

b1k3rdude:

--- Quote from: robbo on 12 October 2020, 08:46:10 pm ---Electrex World actually make a reg/rec
--- End quote ---
Got a link, as ai can see a direct replacement for the FZS but not the one your refering too.

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