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Old 01-06-2018, 08:11 PM   #1
Veritas Aequitas
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BMW GS Adventure

Another Macgyver Moment

Today I was out on the GS and I had a macgyver episode with a harley broken down on the side of the road.

No power. Nothing. Bike just quit.

I have a lot of tools on the GS so we started taking apart. Checked the battery cables... fine. Checked the fuses, once we found them... nada. He had a lot of custom wiring for accessories on the bike... started looking for connector issues or shorts.

Every once in a while the instrument lights would flicker, leaving us to think it might be a short or loose connection.

Another guy stopped and had one of those fancy portable battery jumpers. The jaws on it sucked so we couldnít get a good connection to the battery. He held it there. Didnít seem to improve. Then all of the sudden the back lights went on while I was fiddling with the positive battery cable and and the addíl accessories.

Took it completely off, inspected, and reassembled... nothing.

The owner gave up and called a wrecker.

As I was repacking all the tools I kept thinking about SimTune and occamís razor. For the of it, and to try out my new motorcycle jumper cables I had him pull his battery cover off and I did the same.

My cables had better clamps and we were able to get a connection. Sure as , the lights all came on. After a couple of minutes he hit the starter and it made that rattling sound indicative of a low battery. Let it charge for ten minutes... same result.

Finally his wife jumped on the back of my bike and we went and bought a new battery. Got back and in five minutes with the new battery his bike was running.

Occamís razor baby.

And we got it running
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Old 01-06-2018, 09:45 PM   #2
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Reminds me of a thread in guys husky was running rough. I told him to replace the battery because even a slight weakness in it can make the husky run horrible. Guy refused because he tested it. His shop couldn't fix it. Husky sent some master tech on it and he couldn't fix it. A year goes by and he finally listens to was the battery.
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Old 01-07-2018, 11:42 PM   #3
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First glance at the pic and looked like he was parked @ MSR Houston - I was thinking - he riding that thing there????
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Old 01-08-2018, 10:10 AM   #4
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Originally Posted by Radar View Post
First glance at the pic and looked like he was parked @ MSR Houston - I was thinking - he riding that thing there????
lol that's what I thought too.
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Old 01-11-2018, 04:59 PM   #5
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Had a customer in last week with an '08 Tiffin Allegro Bus diesel pusher. They were on the way to Arizona and had stopped by Freightliner for PM service. 100 miles down the road they started having electrical issues (fridge, rear and cornering cameras, etc.). They stopped 3 times at 3 different shops and spent over 1k in isolator solenoids and I can't remember what else. 5 minutes into diag I found a battery cable disconnected from the chassis battery bank to the coach battery bank isolator. Connected the cable and tracked down a blown 15 amp fuse. Charged an hour labor and wound up with some VERY satisfied customers. Good times and most importantly thank you OP for being a good Samaritan.
'Tis Dirtay Party season!!!
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Old 01-14-2018, 10:49 PM   #6
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Late model twin cams kill batteries. Inadequate charging system for all the sophisticated electronics and fuel injection system plus the heat they put off. The charging system on the Milwaukee 8's is a lot better.

In 100,000+ miles on my evo, I never had to replace any component of the charging system. Not the norm, but I never killed batteries either.
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