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914World.com _ 914World Garage _ Testing SIX alternator

Posted by: trekkor Nov 18 2004, 10:29 PM

I can run my motor on the bench.
The charging harness is dangling out.
What is the simplest way to verify that it is good before I install the motor?

KT

Posted by: McMark Nov 19 2004, 01:06 AM

I have an oscilloscope we can use. I'm sure I can figure it out, but if anyone has tips, post 'em.

Posted by: freezing14 Nov 19 2004, 09:40 AM

hey guys around here in canada,, we have a place that is called canadian tire,, it is like pep boys or autozone and they offer a free service to verify any alternator,, or any alternator rebuilder will do it for 5$ and it is worth it because they check the rotor the outside winding and the regulator if you bring it

Posted by: Root_Werks Nov 19 2004, 11:03 AM

Trekkor, take any 914 voltage reg and hook it up. It is only 3 wires. Conect the big wire up the battery and just read the volt with the engine running at the battery. The 3 wires on the alt are the same as on the volt reg. i.e. just match them up.

df

d-

d+

Those terms are on the alt and volt reg. So just hook them up and you can test! I think even the wire colors are the same from 914 to 911?

Posted by: krk Nov 19 2004, 01:13 PM

(there's lots of good advice already -- but here's what I did last time )

I took my /6 alternator to a local alternator shop that's about 5 mins from the house. (It was dead, which is why I pulled it in the first place, but they checked it anyway) There are probably lots of places that will check it for you.

kim.

Posted by: trekkor Nov 21 2004, 01:41 PM

I thought there was a simple way to just stick a volt meter on one of the wires off the harness to get *something*?

I ran the motor this morning.
Maybe it's time for a video clip.

KT

Posted by: McMark Nov 21 2004, 02:37 PM

Here we go.

http://www.mztech.fsnet.co.uk/electrics/alt_osc.html

When can I bring my oscilloscope by?

Posted by: trekkor Nov 21 2004, 09:20 PM

Mark came over with the scope
Thanks, I owe you a burger.

Looks like the alt is dead right now.
Couldn't get any voltage readings.
Possible diode failure.
We even took it out and spun the unit. You could hear light tinklings.

I'll take it to a shop for final check.

KT