P38A Alternator Charging Voltage 14.8v

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lazbaz

lazbaz

Member
Posts
47
Location
Lichfield, UK
Hi all,
If an alternator was made to deliver 14.8v, will it affect/deteriorate/malfunction/destroy the P48 Instrumentation and functions?
An open debate. Hope to hear all reasons and suggestions.
 
lazbaz said:
Hi all,
If an alternator was made to deliver 14.8v, will it affect/deteriorate/malfunction/destroy the P48 Instrumentation and functions?
An open debate. Hope to hear all reasons and suggestions.
Click to expand...
Not sure what a p48 is but14.8 volts is fine, all the ECU's contain voltage regulators that drop the voltage the IC's use to 5 volts. The regulator is safe to 20 volts or more.
If the battery is low, I see 14.8 volts on my P38 after starting which will gradually drop as low as 13.5 volts
Lead Calcium batteries need up to 14.8 volts to charge, on some modern cars initial charging is at 17 or 18 volts.
 
Maybe not much help but my D3 pretty much runs at 15.1 volts all the time.
 
My p38 alternator is set to 14.7v, rarely I'll see 14.8v show for a moment but it's usually between 13.8 and 14.5 depending on state of charge of the battery. Electrical load doesn't seem to have much impact
 
Datatek said:
Not sure what a p48 is but14.8 volts is fine, all the ECU's contain voltage regulators that drop the voltage the IC's use to 5 volts. The regulator is safe to 20 volts or more.
If the battery is low, I see 14.8 volts on my P38 after starting which will gradually drop as low as 13.5 volts
Lead Calcium batteries need up to 14.8 volts to charge, on some modern cars initial charging is at 17 or 18 volts.
Click to expand...
================
Datatek,
I have Hankook MF31-1000 Calcium battery (I may have posted about it elsewhere). I have looked for a voltage regulator set to 14.8 volts for my Bosch alternator (see pic). Can you help me find one that will fit my alternator or can you suggest what can be done to the alternator to produce 14.8 volts?
I would be much thankful.
Bosch Alternator RR P38.jpg
 
kermit_rr said:
My p38 alternator is set to 14.7v, rarely I'll see 14.8v show for a moment but it's usually between 13.8 and 14.5 depending on state of charge of the battery. Electrical load doesn't seem to have much impact
Click to expand...
==============
kermit
What alternator do you have? Can you show me a pic of it? I would like mine to be 14.7 volts too. See pic attached. I have asked Datatek for advice. I hope someone can help.
 

Attachments

  • Bosch Alternator RR P38.jpg
    Bosch Alternator RR P38.jpg
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lazbaz said:
==============
kermit
What alternator do you have? Can you show me a pic of it? I would like mine to be 14.7 volts too. See pic attached. I have asked Datatek for advice. I hope someone can help.
Click to expand...
I have the same alternator as you. You need to replace the regulator with one set to 14.7v Mobiletron VR-VW010 is the correct one
 
lazbaz said:
================
Datatek,
I have Hankook MF31-1000 Calcium battery (I may have posted about it elsewhere). I have looked for a voltage regulator set to 14.8 volts for my Bosch alternator (see pic). Can you help me find one that will fit my alternator or can you suggest what can be done to the alternator to produce 14.8 volts?
I would be much thankful.View attachment 256946
Click to expand...
Sorry, I do not know the correct regulator for that alternator, I suggest you look at the Mobiltron site.
 
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