Question about 1995 BMW R 100 RT

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My gen light stays on on the dash. I've done the quick test for the alternator and regulator. It says the alternator is faulty and I've done a regulator check which says in the book if the difference in voltage of up to 0.5 volts is found the regulator is faulty and I'm getting up to 7's and 8's volts difference. which says the regulator is faulty as well. I put a new regulator on and it made no difference. I want to go for a 6 hour ride, do you think I should cancel the ride because of this problem?

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  • gavj9 Dec 06, 2009

    yes my battery is getting full charge

  • Anonymous May 11, 2010

    the light means it not charging the battery so yes put off the ride till you check it out you have a digital multimeter? set it to dc volts an check bike not running and then start bike an check again note: 12.6 v is a fully charged battery with bike on should have 13-14v@ battery

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First check all grounds are good and diode pack

if getting 7-8 volts output replace alt/gen unit

Posted on Dec 06, 2009

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Oh yes, i would as your bike will only run for about 2 hours on a fully charged battery,,,if have plenty of extra batterys and dont mind changing them when out go on the run, its that or change the alternator first

Posted on Dec 06, 2009

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This sounds more like a faulty alternator. Sometimes an alternator can still produce adequate voltage and amperage to keep everything running, but they are governed by a voltage regulator. If the regulator goes bad, the alternator may have little of no output, or it will not limit itself properly causing gauge problems, and various light on the dash to not work or sporadically come on.
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Yes it does have an alternator.

When you say "die" I assume you mean it goes flat quickly. If this is the case, then this is normally one of two things - either the alternator is faulty or the voltage regulator is faulty.
Faulty alternators can usually be identified by looking at the switched on headlight and revving the engine. If the bulb doesnt glow brighter when revved, this is usually a sign the alternator isnt working.

If by "die" you mean the battery fails altogether and has to be replaced, this sounds like it is being over charged and this is almost certainly a faulty voltage regulator.

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Also, Honda CBRs made in the 90s have a reputation for their voltage regulators failing often.

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