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Alternator Wiring - 2 terminal Denso
Badger_McLetcher - 31/1/16 at 11:31 PM

'Evening guys, I managed to get a cheap denso alternator off Ebay from a 1.0 litre suzuki swift (2003); it has two terminals on it (one M5 and one M8); can I assume that the M5 is the earth and the M8 is live? Or am I way off base with this? Now it's come around to wiring it up I want to ensure I'm not going to do something stupid!

An example of the alternator here:
VEAAOSwwE5WYGX0" target="_blank">http://www.ebay.ie/itm/Suzuki-Swift-1-0-Alternator-31400-80E1-63321774-/181950262609?hash=item2a5d14ad51:gVEAAOSwwE5WYGX0

NigeEss - 31/1/16 at 11:52 PM

I thought the big fat wore went to the battery and the smaller one to the battery light which then goes to an
ignition switched live.
So effectively the small wire is an alternator switched neutral.


But as I'm crap at wiring, mainly due to being colour blind, I'll wait for an expert to concur.

theprisioner - 1/2/16 at 09:50 AM

I thought all Denso alternators had at least 3 terminals, obviously wrongly the Westfield site has a very useful tutorial that I have used many times with success:

http://westfield-world.com/daihatsu_alternator.html

Dick Axtell - 1/2/16 at 10:05 AM

Hi. I asked for similar advice, not so long ago. Check out this thread - some very specific and useful advice here: -

http://www.locostbuilders.co.uk/viewthread.php?tid=201340.

obfripper - 1/2/16 at 07:12 PM

If the link is correct, you have a marelli alternator rebadged as a denso, which will be wired m8 terminal to battery, m5 terminal to battery warning lamp/exciter circuit.
It's from a european produced suzuki with eu sourced components, the daihatsu/toyota/jap suzuki version is a different alternator with slightly more complicated wiring.

Dave

Badger_McLetcher - 1/2/16 at 09:05 PM

quote:
Originally posted by obfripper
If the link is correct, you have a marelli alternator rebadged as a denso, which will be wired m8 terminal to battery, m5 terminal to battery warning lamp/exciter circuit.
It's from a european produced suzuki with eu sourced components, the daihatsu/toyota/jap suzuki version is a different alternator with slightly more complicated wiring.

Dave


The link indeed is correct, I did wonder why it said "Made in Italy"! Thought they may just have an outpost plant there or something.

Thanks for the info; it makes more sense now that I think of it that it earths via the block. Would the exciter circuit just be a wire from the ignition switch via a lamp?

obfripper - 1/2/16 at 10:21 PM

A bulb via the ignition switch will be fine, if you have an led lamp you'll need a 50ohm 5w load resistor in parallel to give the required exciter current.

Dave

Badger_McLetcher - 1/2/16 at 10:28 PM

Excellent, thanks for that!