BACKUP CONTROL UNIT NEEDED - BMW Luxury Touring Community
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post #1 of 6 Old Jul 1st, 2015, 3:23 pm Thread Starter
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BACKUP CONTROL UNIT NEEDED

Cannot, will not, flat out won't spend over $1600 for a new reverse control unit for my '0 to replace the current one which, for some reason, is draining the battery in 48 hours. Anybody got an extra? Yeah, I know. How about someone parting out an 05 or newer?

I've put on a Wilburs front shock, installed a new clutch, gotten new stainless steel brake lines, had the power center stand pump and motor rebuilt (the only bargain) -- got 2x the money in the beast than it's worth already.

Help !
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post #2 of 6 Old Jul 1st, 2015, 4:15 pm
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Re: BACKUP CONTROL UNIT NEEDED

BBY
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post #3 of 6 Old Jul 1st, 2015, 9:30 pm
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Re: BACKUP CONTROL UNIT NEEDED

Are you sure it is what is draining the battery? Has it been disconnected and hooked back up correctly? The three large black with yellow stripe wires have colored sleeves with the red one to the battery, the black one to the starter tie point and the brown one to the ground tie point. They don't often go bad and the only other one I know of in 11 years here was a guy in Mexico that crossed up some wires and toasted his. They are all the same for all years.
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John
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Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #4 of 6 Old Jul 3rd, 2015, 2:20 pm
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Re: BACKUP CONTROL UNIT NEEDED

Stating the obvious, unless the problem is actually coming from the reverser control internals, you have a slight ground on the hot leg of one of the many pheripheral circuits attached to the reverser control unit.

With electricals, it's always 'divide & conquer'. If it were me, I'd be looking for a chafed wiring at stress points like corners & pinch-points. That may be tough to trace wiring that heads off to multiple points, so I'd also be looking at an item closest to the pavement (think: corrosion). That would perhaps be the sidestand, whose circuit ties into the reverser controler.

If you've the time & patience, you could put an ammeter in series with the +battery term & using lowest amp setting, see if you can see the current drain. Better yet, try to get in series with just the hot wire that powers the reverser controller itself, so that other ordinary parasitic drain items are excluded.
At that point, one could disconnect one suspect circuit at a time & see if there's a difference.

But, I would give a good inspection at the sidestand switch looking for corrosion or any damage to wiring, allowing moisture in.

Another thought is to simply disconnect the reverser controler for 48 hrs & verify whether the batt still discharged. Divide & conquer.

Bob

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post #5 of 6 Old Jul 9th, 2015, 12:02 pm
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Re: BACKUP CONTROL UNIT NEEDED

Go to A&S BMW Motorcycles Microfiche Identify the part and let me know.

I haven't sold this part yet. Bike has less than 120 hours of usage when it broke.
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post #6 of 6 Old Jul 11th, 2015, 3:39 pm
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Re: BACKUP CONTROL UNIT NEEDED

If you are still in the market.... I have one with less than 2,000 miles on the bike.... how many reverses that is...no idea.
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