alternator wiring

Hai guys,
Im Robbie from the netherlands, i am the owner of a ski nautique 2001 (87).
Im having a problem with me alternator..we got it cleaned up and put back, but the guy who took it of forgot to mark the wires..

Now i got a Mitsubishi(dunno if thats original) alternator..from the back of the alternator there are comming 3 wires..

.red
.black
.yellow

from the boat we have 3 wires
.purple
.red
.black

Can someone tell me where to put these wires according to the alternator ?

Thnx in advance

Ow goodie...

Thanx alot mate, this forum rocks..here in Holland nobody knows anything and they charge alot of money to help..

Im gonna try this diagram out and later this afternoon ill make some pictures of my boat along   
with the alternator..

Again thanx alot

Robbie - That isn't a marine alternator - I would recommend you get a new one. The Marine alternators have s screens that prevents their internal sparks from starting an explosion.

Might be worth $100 to save 6 peoples lives.

Robbie, what you have there is a Motorola marine 4 wire alternator. The only sparking it does is behind the voltage regulator cover, it is a very safe, simple alternator, as a boat mechanic, one of the best ever installed. You should have no problems finding parts for it in Holland. I would recommend replacing the voltage regulator every two years and the brushes every 4 or 5 years, real simple and easy maintenance, most often you do not have to remove the alternator to do it unless you got one of those how big of a motor can we put in their boats.

Alternators are tested 9 times in an explosion-proof chamber, a mix of mostly oxygen and natural gas is pumped into the alternator and the alternator is remotely ran or some introduce a "spark plug" in an attempt to ignite the gas. The ideal is to not ignite the mixture. This has to be done 9 times to receive a marine rating. Then to verify that the mixture was correct, the protective coverings are removed and the alternator is blown up by igniting the oxygen natural gas mixture being introduced into the alternator.

This does not in any way replace your nose, if you smell gasoline or even diesel, shut it down, disconnect all power, open the hatches and find the problem.

Yes I know this post is years old, I just hate reading a post where someone tells someone to go buy "something" new so they won't blow their boat up, rubbish.