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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What will make the voltage guage on dash read high And the dash lights stop workingmercury grand marque

voltage gauges read the out put voltage from a alternator
it should be a max of 14.5 to 14.8 volts
if it is higher then the alternator or regulator is faulty and needs removing for a bench test or replacement
there may be a connection to the dash light through the light control module that controls the voltage to those lights
fix one and see it that fixes the second.

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I have a 99 Ford Expedition I was coming home and the battery light came on. Went to the part stor and put in a new battery,now my heater won't turn on and my light don't turn on and my gauges jump around....

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.
I'd take the vehicle to have the alternator tested at least.
Don't settle for one of the part store tests, they won't give you all the information you will need. A properly working alternator should charge anywhere between 13-14.6 volts and depending on the vehicle 90-150 amps.
I hope this helps in some way

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Brother Mark, changing the battery with a new one being done won't make the light go out, as you noticed. Light is still on so you changed the alternator. Good, but the battery light is STILL on. This only means that the charging circuit from the alternator is not working in the voltage regulator or the wiring is not connected properly to the alternator/regulator. A new battery will show over 13 to 13.5 volts not connected. An old battery will still show 12 volts and still be weak or bad. After connected and engine running, the system will show at least 14 volts because alternator/regulator is working properly, using a voltmeter/load tester connected to the battery. If after replacing the battery and alternator it is still reading 12 to 13.5 volts, it is not working and the light will stay lit on the dash. You may have purchased a faulty alternator if the system tests out this way. Have your system checked with a volt meter or load tester bit be sure all the connections are proper and clean.

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2000 chevy silverado 1500 battery light keeps coming on then going off.The voltage meter on the dash will flutter also.This has been going on for awhile now until the other day it came on and stayed on...

When was the alternator replaced? was it a remanufactured alternator? This is common on GM trucks, fluctuating voltage is caused by a faulty alternator voltage regulator. Have the alternator tested, strong possiblityits defective!!Hopefully this helps!!

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Does a 1993 honda cbr 1000 has a alternator. My new battery die quickly.

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.

However, as with most things in life, these are not foolproof tests, so unless you have a good understanding of electrical items, and some test equipment such as a good multimeter, it's probably best to take it to a workshop.

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

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