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 Post subject: Lamp wattage requirement for alternator (to excite diodes)
PostPosted: Sun Mar 03, 2019 2:45 pm 
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Joined: Wed Apr 28, 2004 3:03 am
Posts: 2056
Location: Canberra
So am foolishly? rewiring my GTi. After a couple of different ECU's, stereo's and car alarms its a bit of a hack job so am stripping it all back and cleaning it up. Going surprisingly well all things considered!

Just looking at wiring the alternator for the lamp to excite the diodes for charging. As I have removed the dash (got aftermarket digital dash) was going to fit a separate small filament lamp. From my reading it seems that generally most alternators require a 3-5W globe. Any different for the GTi standard alternator?

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 Post subject: Re: Lamp wattage requirement for alternator (to excite diodes)
PostPosted: Mon Mar 04, 2019 5:45 pm 
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Joined: Mon Oct 12, 2015 11:30 am
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Location: Napier
I would not think it any different for the GTi. most alternators are all the same. They all need to output around 14v for charging. 5W/12 = 0.41A

Good description here - https://www.practicalmachinist.com/vb/g ... ght-78415/

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 Post subject: Re: Lamp wattage requirement for alternator (to excite diodes)
PostPosted: Tue Mar 05, 2019 8:41 pm 
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Thanks for that

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