Help with this diagnosis please - BMW Luxury Touring Community
 
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post #1 of 13 Old Apr 10th, 2011, 6:12 am Thread Starter
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Help with this diagnosis please

Run a few hundred miles this year so far. Had a slight rough running period, but it cleared up on its own
Friday I came to start the bike:
Turned Key - no fuel priming noise
Starter motor turned over fine. Just wouldn't start
Put battery on charge after it got prety dead.
Today turned key - NO sign of any electrics at all. No lights, no dash nothing
Battery charger shows batter OK

Anyone had this and know what ot maybe or anyone have a good diagnosis or list of where I had best look first?

Thanks

"Whenever you find you are on the side of the majority, it is time to pause and reflect" Mark Twain


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post #2 of 13 Old Apr 10th, 2011, 7:26 am Thread Starter
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Re: Help with this diagnosis please

Battery showing 6v, so not charged up yet.
Real pain that as I cant do any more electric checks for a week now.

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post #3 of 13 Old Apr 10th, 2011, 7:45 am
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Re: Help with this diagnosis please

Quote:
Originally Posted by c00k1e
Battery showing 6v, so not charged up yet.
Real pain that as I cant do any more electric checks for a week now.
Most small battry chargers have a safety feature -- they won't start charging unless they sense a minimum voltage from the battery (on the order of 10V).

In this case, however, it would not have mattered -- you battery is dead, dead, dead, and a charger's not going to bring it back. 6V is "perform the funeral, and install a replacement" time.

Mark Neblett
Fairfax, VA
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post #4 of 13 Old Apr 10th, 2011, 8:36 am
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Re: Help with this diagnosis please

yup dont waist your time replace the battery i bet it will cure your problems

even if your charger does but life in that old one. it will let you down probably on the side of the road. not your shop
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post #5 of 13 Old Apr 10th, 2011, 12:25 pm
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Re: Help with this diagnosis please

Quote:
Originally Posted by c00k1e
Battery showing 6v, so not charged up yet.
Real pain that as I cant do any more electric checks for a week now.
If you are seeing 6V on a 12V lead acid battery, it is gone well beyond where a charger can salvage. Get thyself a new battery before you damage your bike.

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post #6 of 13 Old Apr 10th, 2011, 3:26 pm
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Re: Help with this diagnosis please

well yes and no. Most issues with "dead" batteries are due to sulfation on the plates. In that condition they will not work really at all but there is something you can do. There are a number of units on the market that will desulfate your battery and bring it back but unless youve another use for it (like a solar power system) then its not worth the $100-150 itll cost for the unit compared to a new battery for about $80. these units will work quite well on "dead" batteries as I have saved quite a few doing this. My advice? get a new battery unless you have one of these units (not a battery tender although they (the good ones) do have a desulfation cycle its not the same thing).
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post #7 of 13 Old Apr 10th, 2011, 3:28 pm
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Re: Help with this diagnosis please

but do get a battery tender as itll greatly extend the life of your new battery (if you actually use it heh)
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post #8 of 13 Old Apr 10th, 2011, 3:45 pm
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Re: Help with this diagnosis please

Quote:
Originally Posted by Drumbum
well yes and no. Most issues with "dead" batteries are due to sulfation on the plates. In that condition they will not work really at all but there is something you can do. There are a number of units on the market that will desulfate your battery and bring it back but unless youve another use for it (like a solar power system) then its not worth the $100-150 itll cost for the unit compared to a new battery for about $80. these units will work quite well on "dead" batteries as I have saved quite a few doing this. My advice? get a new battery unless you have one of these units (not a battery tender although they (the good ones) do have a desulfation cycle its not the same thing).
If the battery had 11 volts or even 10.5, then a 15V or so reversing charge might bring it back as might one of the anti-sulphate chargers such as my BatteryMINDer. However, a battery that is down to half its nominal voltage likely has several cells completely shorted out by sulphation. I have never seen a batter with static voltage less than 10 volts ever brought back to any state of usefulness.

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post #9 of 13 Old Apr 15th, 2011, 6:43 am Thread Starter
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Re: Help with this diagnosis please - update

OK thanks guys
Bike recovered and stripped down.
Got an Odyssey battery as I love the specs on them
The fuel pump primed first time and the bike started
BUT..........
I have this nagging feeling that the battery problem was secondary:
The breakdown happened due to the fuel pump not priming, not a dead battery - to start with anyway. The started motor was turning over nice and hard before the battery died.
Could that have happened if the battery was really dead then?
Or
do I have a loose wire somewhere?
Only time will tell I guess.

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post #10 of 13 Old Apr 15th, 2011, 7:38 am
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Re: Help with this diagnosis please - update

Quote:
Originally Posted by c00k1e
OK thanks guys
Bike recovered and stripped down.
Got an Odyssey battery as I love the specs on them
The fuel pump primed first time and the bike started
BUT..........
I have this nagging feeling that the battery problem was secondary:
The breakdown happened due to the fuel pump not priming, not a dead battery - to start with anyway. The started motor was turning over nice and hard before the battery died.
Could that have happened if the battery was really dead then?
Or
do I have a loose wire somewhere?
Only time will tell I guess.
Probably still the battery. The starter motor can be crankin' away, but if the battery is in poor shape, the starter will draw the voltage down -- and if the voltage is too low, the Moronic computer won't function, and therefore no fuel injector signals. That seems to fit your dry sparkplugs data point, too.

Mark Neblett
Fairfax, VA
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post #11 of 13 Old Apr 16th, 2011, 8:07 am Thread Starter
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Re: Help with this diagnosis please

All back together and guess what?
Yep
No fuel pump noise and won't start
ARRRRRRRRRRRRRR

I just hope she wont start again till i find the problem this time!

"Whenever you find you are on the side of the majority, it is time to pause and reflect" Mark Twain


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post #12 of 13 Old Apr 16th, 2011, 9:16 am
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Re: Help with this diagnosis please

Quote:
Originally Posted by c00k1e
All back together and guess what?
Yep
No fuel pump noise and won't start
ARRRRRRRRRRRRRR

I just hope she wont start again till i find the problem this time!
Next place I would look is the fuel pump wiring -- is the power connector fully seated? do you have 12V at the bike side of power connector (at least for a couple seconds when the iginition is turned on)? do you have continuity on the other side of the connector (i.e., intact wiring to/from the fuel pump)?

Mark Neblett
Fairfax, VA
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post #13 of 13 Old Apr 16th, 2011, 9:30 am Thread Starter
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Re: Help with this diagnosis please

You guessed it Mark
It was a faulty earth connector to the fuel pump
YYYYYYYYYEEEEEEEEEEEEEEEEEEEEEEEHHHHHHHHAAAAAAAAAA AAAAAAAAAA

Cheers bud!!

"Whenever you find you are on the side of the majority, it is time to pause and reflect" Mark Twain


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