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2004 BMW R1150RT

Oilhead

New member
Joined
Apr 23, 2022
Member Number
1130
Posts
2
Location
The Woodlands, Texas
Think I just need to replace the battery...BUT:

How much voltage should my alternator be putting out?

I have a garmin that indicates the alternator is putting out around 13.6 volts.
 

FLrider

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Feb 8, 2022
Member Number
181
Posts
293
Location
Ft Lauderdale
From memory :gerg I believe that the oilhead alternator runs at 14v +/- 0.5 v depending on temperature. Hope that helps…

Edit: yours is at the lower end so perhaps a thorough check may in order..
 

Oilhead

New member
Joined
Apr 23, 2022
Member Number
1130
Posts
2
Location
The Woodlands, Texas
Thanks...

To add, just finished replacing the battery that was at least 10 years old. Figured that was my issue. After installing the new battery, voltage as shown on the Garmin unit was still at 13.5-13.6. Got out my multimeter and checked at the battery and was getting 14 volts.
 

FLrider

Well-known member
Joined
Feb 8, 2022
Member Number
181
Posts
293
Location
Ft Lauderdale
That is good voltage. It is better to measure at the battery with a volt meter and the engine running rather than getting a readout from any external device like a gps..
 

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