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Deciphering Alternator wires #4727522
04/15/18 09:12 AM
04/15/18 09:12 AM
Joined: Jan 2014
Posts: 438
Australia
Spetz Offline OP
Spetz  Offline OP
Joined: Jan 2014
Posts: 438
Australia
Hi everyone,

My ECU is storing an alternator FR terminal code.

It is a 4 pin alternator and just wonder what the 4 wires would be for and how to decipher which one each is?

Of the 4 pins/wires I know only which one the FR signal is and for testing purposes I'd like to know what the other 3 are.


2003 Mitsubishi Diamante 6G74 3.5L. 5 Speed auto. 155,000 miles. Shell Helix Ultra 5W40 at 6k OCI
Re: Deciphering Alternator wires [Re: Spetz] #4727589
04/15/18 10:04 AM
04/15/18 10:04 AM
Joined: Aug 2017
Posts: 559
MN
14Accent Offline
14Accent  Offline
Joined: Aug 2017
Posts: 559
MN
I'm only seeing a 2-wire connection on the alternator diagram for an '03 Diamante.

The RD/WT wire comes from fuse 8 in the engine compartment relay box, and the WT wire comes from the generator relay in that same box. The generator relay passes power from fuse 12 in the interior fuse box.


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

2003 Cadillac Seville STS - The winter "beater", it uses the Volt's fuel
Re: Deciphering Alternator wires [Re: Spetz] #4727612
04/15/18 10:22 AM
04/15/18 10:22 AM
Joined: Jun 2003
Posts: 33,104
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,104
ME
Usually it's field pos, field neg, +12V voltage sense (to cover for loss on the big wire), dash warning light, and big-lug positive out.

Re: Deciphering Alternator wires [Re: Spetz] #4728111
04/15/18 06:27 PM
04/15/18 06:27 PM
Joined: Jan 2014
Posts: 438
Australia
Spetz Offline OP
Spetz  Offline OP
Joined: Jan 2014
Posts: 438
Australia
Thanks guys,

It's not for my Diamante, it's for a Mitsubishi Mirage with a 6A12 engine swap from an FTO.

It is throwing an "Alternator FR Terminal" error and has a 4 pin type plug.
I've replaced the alternator and tested a different ECU but the error still shows up.

So to do more testing I am trying to figure out which wire is which


2003 Mitsubishi Diamante 6G74 3.5L. 5 Speed auto. 155,000 miles. Shell Helix Ultra 5W40 at 6k OCI

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