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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old September 7th, 2013, 09:16   #1
Join Date: Aug 2012
Location: Canada
Fuel Economy: Roughly 45 MPG
Default Voltage regulator; voltage needed and bosch quality?


I have read about voltage regulators but i can't find the thread anymore...

What is the supposed voltage output? I have read somewhere that Bosch regulators did not give enough voltage output. My alternator actually gives about 14.0 Volts but my not so old battery seems to have hard time on the mornings.

I think i remember reading that it should be something like 14.5 or 14.8 volts...

Just needed that info!

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Old September 7th, 2013, 11:50   #2
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Join Date: Oct 2005
Location: Il.USA
Fuel Economy: 43/41/40

My Bosch 120 amp alternator puts out between 13.5 and 14.0 volts depending on the ambient temperatures. Lower in the Summer and higher in Winter. I have a digital volt meter in my cig. lighter that agrees with the readings on my SG.
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Old September 7th, 2013, 12:45   #3
Vince Waldon
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Join Date: Apr 2009
Location: Edmonton Alberta Canada

The range is generally seen to be 13.5-14.5, depending on temperature, so you're fine.

North of 14.5 starts to boil the battery.
Vince Waldon Edmonton AB Canada

Note: The above is to the best of my knowledge- but at the end of the day simply interweb opinion, worth EXACTLY what you paid for it, and if used done so at your own risk.
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Old September 7th, 2013, 13:33   #4
Cogen Man
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Join Date: Jun 2011
Location: Kingston, Ontario, Canada
Fuel Economy: Better than the Toyota FJCruiser

Right now my 2011 Golf shows 14.1-14.2 on a fully hot engine. This is from my SGII. My wife's 2011 Golf will show 13.8-14.0 on her SGII.
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