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90A ALTERNATOR UPGRADE FOR MK3 :: FAQ!

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running a big ice install? lots of auxiliary equipment? have no fear!

i used a 90A alternator as found on big block golfs (ones with air con, powersteering etc have 90A ones).

first off, you need to fit the polo pulley onto the golf alternator. i had to mod one of the spacers to go on but its nowt 2mins with a file wont sort. (the golf alternator has a keywayed shaft, polo one doesnt).

i then drilled the top mounting hole out from 8mm to 10mm as the polo uses a 10mm bolt.

the next problem is the tensioner bolt hole (the one with the cogged wheel on) is in a different position, so i made an extension bracket:

bracket.jpg

you bolt one end to the engine, and the standard tensioner bracket on the other end with a 12mm spacer between (i used a stack of washers as a temporary fix, i will make a proper spacer later)

DSCF3103_small.jpg

DSCF3102_small.jpg

then you just gotta bolt the wires onto the terminals and put the polo belt on and your good to go!

DSCF3100_small.jpg

Another FANTASTIC modification brought to you by:

mint.jpg

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dont forget to put a chunky new earth cable on too while youre at it ;)

  • Author

you mean that pissy blue one? it also earths through the engine mount doesnt it?

i think he means the one that it looks like youve replaced (from engine mount to chassis.) that blue wire has something to do with the warning system in the car i think.

its the one that bolts to the chassis, looks like its the red one in your pic pinchy, or is that from the battery?

they're two of 'the big three' (third one being battery to chassis earth) which helps prevent bottle neck in current flow which is what causes headlight dimming

I presume this would fit to a mk2 as well? How do distinguish a big block golf? or are they the only ones with power steering and air con? what marks do they come on because i'll raid the scrap yard on friday :thumbsup:

  • Author

mk2 is same then yeh....

big block golfs e.g mk1/mk2 1.6/1.8 also passats, jettas etc

i will have to find out the code for the 90amp i had as i might need another

but mine was more of a direct replacement to fit

i will go find the bloke and find out for you

  • Author
i will have to find out the code for the 90amp i had as i might need another

but mine was more of a direct replacement to fit

i will go find the bloke and find out for you

well i asked you about that over a year ago and you never looked

and i forgot to look before i sold it sorry

still waiting for bloke to get back to me

  • 2 months later...

wood it be a good idear to upgrade the batter to?? if so to what??

A 063 or 065 is fine. It's only there to start the engine.

  • 2 years later...

theres no space for anything bigger unless u can some how make a different way of hinging the bonnet or relocating the battery

i got mine from a mk3 golf you can also get a 120a from a vr6 these are slighty different will do write up oin a bit for you

  • 2 weeks later...

if you get one from a diesel then they are normally a straight swap apart from the pulley as the diesels mount the opposite way too the petrols due to the injector pump

  • 5 months later...

will this mod fit a g40????????

sorry for sounding dum but mines struggling with my install and could do with some more juice.

Kieran

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