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29 Aug 2015
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power loss on R100GS
I'm really inexperienced at this stuff, particulary in regard to electrical/ignition issues. I'm desperate for help.
Initially I was riding my 92 R100GS about 10 miles, when the bike just died as I was riding it. When I tried to re-start it, the engine turned over, but it wouldn't fire up. It turned out that the there was no spark at the plugs.
In trying to troubleshoot why the plugs were not sparking, I made a very stupid and rash decision. The plugs in the bike are Bosch Super RO 668's. This morning, suspecting that something might have been wrong with it, I removed the right cylinder plug and replaced it with an older one, a Bosch RO 948. I left the 668 in the left cylinder and fired the bike up. It turned … and then I lost all power a second later, and still don't have any.
Now when the key is turned on and the kill switch is also on, I get an intermittent electric buzzing sound from one of the relays. But with the kill switch off, no buzzing.
My question: Can anyone please tell me what I might have screwed up by doing this? How I might be able to restore power?
Please help.
Thank you.
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29 Aug 2015
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Sounds like you need to replace the relay but I am no mechanic. I found this article that might be of some use.
BMW Airhead Motorcycle Electrical Hints
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29 Aug 2015
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One of the two black relays is making the buzzing sound. So I removed it and replaced it with a new one.
Still no power.
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29 Aug 2015
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hmmm....That's a head scratch-er. It should run with just one spark plug firing albeit very badly but it should still run. The only other suggestion I have is to try replacing the other spark plug. Check all electrical connections on the battery terminals. Make sure there is no corrosion. Other than that you may have to take it to the shop.
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30 Aug 2015
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I wasn't getting any sparks at the plugs before the power failure; that was the problem I was troubleshooting when I fu..ed up and turned the bike over with the two different plugs, causing the power failure.
After the power failure, I replaced both plugs with new ones. Same problem. And yes, I learned from my costly mistake in that I put two identical plugs in.
The last thing I want to do is bring it to the shop. I ain't fond of bending over. 
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30 Aug 2015
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Basics
Is there battery voltage at the ignition coil? (No.. then fault find that.)
Is the battery voltage above 12.5 volts? (If the battery is flat you won't get spark.)
Flick the kill switch back and forth between 'on' and 'off' - get spark? (Spark indicated ICU and battery connection ok.)
Is there spark when the HES (bean can) connectors central pin is shorted (and then opened) to earth? (connector under front engine cover, disconnect battery negative to avoid shorting out the diode board - then reconnect the battery negative for testing. Disconnect the HES and short/open the central pin of the connector that runs upwards to the ICU.)
================================ Caution =============== Applies to any electronic ignition ===
You can blow up the ICU if you operate the bike without the spark plugs attached (and their bodies connected to the bike - providing an electrical contact back to the battery negative)
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30 Aug 2015
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Is the battery voltage above 12.5 volts? (If the battery is flat you won't get spark.)
Yes. 13 volts.
Is there battery voltage at the ignition coil? (No.. then fault find that.)
NO. (some, but in millivolts.)
How do I fault find that?
By the way, the ignition coil is brand spanking new. Also, when I initially only had the problem of no spark at the plugs, I WAS getting voltage to the coils. Now, after fu..ing up by putting two different plugs in the bike and turning it over which resulted in the power failure, there is NO voltage to the coils.
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30 Aug 2015
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Quote:
Originally Posted by newbie1
Is the battery voltage above 12.5 volts? (If the battery is flat you won't get spark.)
Yes. 13 volts.
Is there battery voltage at the ignition coil? (No.. then fault find that.)
NO. (some, but in millivolts.)
How do I fault find that?
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There are 4 terminals on the ignition coil;
2 are the HT leads to the spark plugs.
1 goes to the battery through the engine kill switch then on to the ignition key switch and probably a fuse
the remaining one has 2 small black wires on to, one wire goes off to the tachometer, the other wires goes off to the ICU.
Both of the smaller wires should have battery voltage. The ICU wire will pull the battery voltage down towards 0 for some time .. say 30 seconds while it waits for the motor to start up. If the motor does not start up then it should release the voltage back up towards battery voltage. Test the other terminal for battery voltage .. if it is not there then you probably don't have the warning lights either (alternator and oil pressure)? If not then look at the engine kill switch, ignition key switch fuse... If you have the lights and not battery voltage on the coil then the wires/connections between the two need to be looked at.
Warning:
The coil terminal with the two small black wires .. when the bike is running there is a large AC voltage here .. some 300 volts ... best to keep fingers away from this. Only meaure here when the engine is not running .. and after say 30 seconds of it being stopped.
Last edited by Warin; 30 Aug 2015 at 06:12.
Reason: add warning
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30 Aug 2015
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Thank you very much for your help with this, Warin.
I am going to proceed, very slowly and deliberately, to try to digest what you've said and then go about testing what you mentioned.
This will take me a while. I will update throughout the day as I find out material information.
I really appreciate your help.
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30 Aug 2015
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Quote:
Originally Posted by Warin
Test the other terminal for battery voltage .. if it is not there then you probably don't have the warning lights either (alternator and oil pressure)? If not then look at the engine kill switch, ignition key switch fuse... If you have the lights and not battery voltage on the coil then the wires/connections between the two need to be looked at.
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I have no telltale lights, nor headlights ... no lights whatsoever.
I began with the ignition switch. Trying to follow Clymer's instructions, I disconnected the ignition switch electrical connector from the wiring harness. Then Clymer says to test "the indicated wires in the switch side of the electrical connector and check for continuity in all switch positions."
I have attached a picture of the switch-side connector to make sure I have the right part.
Two things:
1) There are no "wires in the switch-side" of the connector, just 4 receptacles for the pins coming from the wiring harness.
2) I have no idea what I'm doing, of course, but here's what I did anyway. I set my multi-meter to Ohms and placed the two probes in all 6 combinations possible. I got 0 Ohms in every instance. I also repeated this where the wires of the switch are soldered underneath the key ignition mechanism at the dash, and got 0 ohms as well.
Did I do the right thing? And if so, does that mean the ignition switch needs to be replaced?
Or did I not test for continuity correctly? If not, please tell me how to test the disconnected switch-side with the multi-meter.
Thank you.
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31 Aug 2015
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When you say 'power loss' ... I think you have lost engine power ... not electrical power ... remember I cannot see what you see so have to rely on what you type. 
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Check your fuses. Do this by looking for battery voltage on each side of the fuses. Ignition key switch on - this should power up the fuses.
If only one of the 3 fuses has power then the key switch is suspect, or the wires to/from it.
If a fuse has power on one side and not the other then that fuse may need replacing.
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Looking at your wiring diagram ... if the starter motor is turning over you must have power to the ignition coil ...? And that should power the warning lights! Something does not make sense here. Finding the common link to the other lights (brake light, headlight etc) is the challenge.
================= Edit ====
Errr while I'm concentrating on the battery supply .. should also consider the battery negative!
There should be a lug with a few brown wires connecting to earth .. usually on a bolt for the ignition coil mounting. Check that it there and tight.
Last edited by Warin; 31 Aug 2015 at 01:22.
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31 Aug 2015
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Quote:
Originally Posted by Warin
When you say 'power loss' ... I think you have lost engine power ... not electrical power ... remember I cannot see what you see so have to rely on what you type. |
Then I misspoke.
What I have is complete and utter electrical failure.
At first, my problem was not being able to get the bike started. At that point, there was voltage to the coils, all lights were working, and the engine was turning over. The problem was there was no spark at the plugs, so the bike wouldn't start, and that was the problem I was initially troubleshooting.
Then, after I turned the bike over with two different plugs (while I was troubleshooting the initial problem), that is when I experienced complete electrical failure. I thought "loss of power" conveyed that. I was wrong. I apologize.
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Quote:
Originally Posted by Warin
Check your fuses. Do this by looking for battery voltage on each side of the fuses. Ignition key switch on - this should power up the fuses.
If only one of the 3 fuses has power then the key switch is suspect, or the wires to/from it.
If a fuse has power on one side and not the other then that fuse may need replacing.
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Please forgive me Warin, but I am even more lost than usual here. As far as I know, there are 4 fuses on my bike. They are of the spade variety, 15A, located on the side of the battery.
Are there other fuses on my bike (i.e. 1992 R100GS) I'm unaware of? I've looked at Clymer and Haynes for additional fuses, but can find no others. 
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31 Aug 2015
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Quote:
Originally Posted by newbie1
I apologize.
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No need .. just explaining my confusion
Quote:
Originally Posted by newbie1
As far as I know, there are 4 fuses on my bike. They are of the spade variety, 15A, located on the side of the battery.
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Me again... must be the cool mornings
Was using a different year ... Ok 4 fuses spaded
Measure the voltages .. on the spades there is a bit of metal showing on both ends .. measure on both ends - should be the same on both ends .. if not = blown fuse.
------------------
One fuse will have battery voltage at any time,
two with the ignition key switch on
the remainder with the ignition key switch on and the headlight switch on
So turn on the ignition key switch on and the headlight switch and test those fuse voltages.
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31 Aug 2015
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I already suspected that I blew a fuse, so I removed all 4 and looked at them. They looked fine. But just to be sure I replaced all 4 with brand new ones. (I guess I should have mentioned that already. Sorry again.) Of course, the new fuses didn't help. Still got nothing.
And just to be clear, as I stated above I replaced the spark-plugs with brand new, identical ones (after the botch with the different plugs which preceded the electrical failure). No help here either, of course, again.
Now, I am again thinking of the ignition switch. When I turn the ignition on and the kill switch off, I get absolutely nothing. But with the ignition on and the kill switch also on, I get an intermittent buzzing/clicking at one of the black relays.
(By the way, I already removed both black relays and replaced them with two brand new ones I had lying around. Didn't help.)
So, now do I focus on the ignition switch, like I started to before? Or the kill switch? Something else?
Thank you, Warin. You're a lifeline.
Last edited by newbie1; 31 Aug 2015 at 03:31.
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31 Aug 2015
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The spade fuses .. do they have a small area on top at each side where there is a bit of metal showing? This is with the fuses in the holder .. just look at the exposed tops. Use that area to measure the voltages on each fuse - ignition key switch on, headlight switch on.
This will tell you if there is battery voltage;
before the ignition key switch
after the ignition key switch
after the headlight switch
The spark plugs have nothing to do with the lack of headlights.
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