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Author Topic: Alternator question  (Read 2140 times)

December 04, 2008, 09:27:13 am

zozep

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Alternator question
« on: December 04, 2008, 09:27:13 am »
Anyone know what charging output the alternator puts out on a 1.6 TD?
Mine is putting out alittle over 13v and I just want to make sure thats normal, I heard that on American cars its 14.5v
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SOLD: 92 Jetta TD, Giles Pump set to 30 psi, MLS Head Gasket, ARP head studs, Huge eBay intercooler, blocked WG, FK suspension, 1.9L AAZ downpipe to 2.5 inch straight back.

Current: 2000 TDi, 01M :(  DG Full skid plate, Cat 2 micron Fuel Filter, Scanguage II, 4700kHIDs, DG RacePipe
Reply #1December 04, 2008, 09:28:41 am

Vincent Waldon

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« Reply #1 on: December 04, 2008, 09:28:41 am »
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Vince

Edmonton, Alberta, Canada
2001 silver TDI Jetta Malone Stage 1.5 , 2001 blue TDI Jetta SBIII 216s Malone Stage 3, 1970 Bay Window bus

Gone but not forgotten: 1969/1971 Beetles, 1969/1974 Westies, 1979 Rabbit, 1986 TD Jetta, 1992 gas Jetta, 1994 TD Jetta
Reply #2December 04, 2008, 10:49:30 am

arb

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« Reply #2 on: December 04, 2008, 10:49:30 am »
As you see in that former thread, you need more than 13V - a 6 cell lead acid battery needs to see at least 13.6v at the terminal to fully change. Each cell develops 2.2v.  I didn't want to spen a lot of money for a reman alternator, so I made brackets for a Chevy.
http://www.vwdiesel.net/phpBB/viewtopic.php?t=15633&postdays=0&postorder=asc&start=60
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Reply #3December 04, 2008, 12:03:04 pm

zozep

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Alternator question
« Reply #3 on: December 04, 2008, 12:03:04 pm »
so what you're saying is...if I'm seeing a little over 13v then it's not enough to charge the battery then...
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SOLD: 92 Jetta TD, Giles Pump set to 30 psi, MLS Head Gasket, ARP head studs, Huge eBay intercooler, blocked WG, FK suspension, 1.9L AAZ downpipe to 2.5 inch straight back.

Current: 2000 TDi, 01M :(  DG Full skid plate, Cat 2 micron Fuel Filter, Scanguage II, 4700kHIDs, DG RacePipe
Reply #4December 04, 2008, 01:04:17 pm

smutts

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Alternator question
« Reply #4 on: December 04, 2008, 01:04:17 pm »
Usual voltage with charged battery and fast idling engine is 14.3v to 14.4v . Try the battery voltage after the engine has stopped 20 minutes. 12 and a half volts or more is good. 10.5 volts you have a shorted cell and an alternator killing itself trying to shove enough juice into that battery trying to get it to that magic 14.4 volts.

If its Bosch, the brushes are sold with the voltage regulator attatched, £15 and two little screws and two minutes of time. Easy.  If it's Valeo? Not so easy.

Got an oscilloscope? See what ripple you get out of it. You can see if a phase has died.
 :twisted:
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