Intermittent electrical issue, 81 GS1100e

[Guest]

For awhile my GS1100 would have some trouble starting when hot, sounding like the starter motor was going bad.

But the other day I went to start the bike, and as soon as I hit the ignition, all the lights/power went out. I turned the key a few times, and got no response...power all stayed off. When I went back the next day, the lights did come on when I turned the key, but went off again when I hit the ignition. I tested the battery and it's fine. I checked the starter relay with a multimeter and would get power there when the key was Off, but no power when the key was On. I checked all my connections and everything seems fine.

I went again today to see what would happen, and the lights actually stayed on when I hit the ignition for the first 10 or so tries, but finally did go out again. I'm having a tough time figuring this out since the issue is not very consistent. Am I overlooking a short circuit somehow? I'm confused as to how the power will come on if I leave the bike alone over night. Thanks in advance for any suggestions.

[gsrick]

For awhile my GS1100 would have some trouble starting when hot, sounding like the starter motor was going bad.

But the other day I went to start the bike, and as soon as I hit the ignition, all the lights/power went out. I turned the key a few times, and got no response...power all stayed off. When I went back the next day, the lights did come on when I turned the key, but went off again when I hit the ignition. I tested the battery and it's fine. I checked the starter relay with a multimeter and would get power there when the key was Off, but no power when the key was On. I checked all my connections and everything seems fine.

I went again today to see what would happen, and the lights actually stayed on when I hit the ignition for the first 10 or so tries, but finally did go out again. I'm having a tough time figuring this out since the issue is not very consistent. Am I overlooking a short circuit somehow? I'm confused as to how the power will come on if I leave the bike alone over night. Thanks in advance for any suggestions.

Have your battery load tested. Even if it shows 12+ volts it may not be able run a starter. The battery will recover on it's own some and show enough voltage, but the amperage isn't there. Have you put your voltmeter on the battery and checked out the reading while trying to start it. I guessing it drops down quickly from 12V to 5 or 6V, then bounces back up to around 10, after releasing the button.

[obxGS1100]

Battery was reading at 11.9 when I had last tried, so I gave it a full charge on a trickle charger overnight and the bike started right up....but I'm still confused as to why power would completely shut off when I hit the ignition before? Curious why an underpowered battery result in that?

[Steve]

An underpowered battery will do that because it's ... (wait for it) ... underpowered.

It's like you saying you can breathe just fine, but when asked to do a 10-second 100-yard dash, you have a bit of difficulty catching your breath.

Eventually you will recover and breathe somewhat normally, but right after the effort, there is nothing in reserve to handle the lights, etc.

It's time for a new battery. Not just a charged battery, a NEW one.

And, while you are at it, look for a sealed AGM battery. That is a construction type, not a brand name.

.

[hillsy]

If your bike was previously having trouble starting when it was hot you might also want to check your charging system is working properly.

[Burque73]

Electrical issues had been maddening with my 850 for months. Late last year I had a battery that seemed to hold a charge and would crank strong right off the charger but not more than once. It tested at 12 volts so I thought it was ok, but at the retailer where it came from, batteries plus, they tested it under a load and it was shot. With the new battery the bike ran ok for a while, or so I thought, but again the battery went bad. A couple of symptoms were missed on my part which were inconsistent sort of shuddering idle, dimming lights when blinkers were on. The main thing I neglected to perform was a charging test. This would have revealed that the Reg/ Rec unit was over charging the battery and shortening the life of it, also sending inconsistent amounts of current through the ignition and entire electrical system. After changing the stock R/R out with a SH-775 and rewiring it directly from the stator abandoning the headlight loop, and cleaning the connections etc, the bike charges like it should. It also starts easier and runs smoother with a more consistent idle.

Hope that helps some.

[posplayr]

You could have done a "quick test"