Resolved 2G Alternator works but it won't charge the battery..

[randizzle420]

I just bought a new battery, and it kept going dead when I was driving it. I was pretty positive it was the alternator because I tested the battery when the car was on, and it was only 12 volts. I took the alternator off, took it to pep boys, they tested it, and the alternator is fine, was putting out 14. something volts. Any ideas what the problem might be?

 

[TalonKaos]

It's called the generator relay in the Mitsu manual. From the Mitsu manual: "The generator relay functions as a backup for the flow of electricity to the rotor coil (field coil) if there is a disconnection or damaged wiring of the charging warning light." It actually is a resistor and diode in series but looks like and is referred to as a relay. (FYI: It is connected in parallel to the charging warning light, it's diode and the 10A fuse.) Something must be banging into it as I hear quite a few complaints of it being distroyed. You may have a problem getting an aftermarket one as every time I've asked they say they never heard of it. Should you find an aftermarket let us know where you got it and the price.

http://www.dsmtuners.com/threads/omron-relay-is-it-broke.402040/

Is this what your looking for? There are pics..

 

[91Bomb]

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1g 80 amp alternator fuse (circled in red) is under hood of car.

 

[luv2rallye]

The alt relay is only a backup for the charging system warning light (should it burn out) and on the 2g it's next to the boost control solenoid. One of the two must be working for the alt to work. NAPA supposedly has the 2g ones: http://www.dsmtuners.com/threads/help-figuring-out-what-relay-this-is.417383/#post-152762759

 

[o0GuitarKid0o]

Ecu controls charging in a 2g but +1 on the light and relay

 

[o0GuitarKid0o]

There is no alternator "relay", If your alternator is not charging the battery double check the fuse

There sure is my fuse box calls it a relay so... it's a relay (look a few posts up at the pic) but I have a 1g 91 and heard but haven't confirmed that 2gs dont have it

 

[luv2rallye]

Both 1g's and 2g turbo (but not 2gNT) have one but on the 2g it's next to the boost control solenoid. Mitsu calls the 1g one an alternator relay and the 2g one a generator relay. Even though they call it a relay, inside it's actually a diode in series with a resistor. It's purpose is to supply voltage to the alt's field coil (in case the alt light doesn't work which is in parallel with this) so the alt will function.

 

[91Bomb]

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I'd check these fuses + relay if my alt wasn't charging and especially the 80 amp (top right) and relay (top left). On 1g's are there any other fuses or relays to check if alt isn't charging at all?

 

[Diamond Star Werks]

On my 98 Spyder the relay wires/connector is on drivers side under power steering reservoir. Just an fyi for those that see this in the future, that's 2g n/t spyder placement of the relay. Factory diagram supports this location.

 

[luv2rallye]

That's on the 2.4L engine (not the 2.0 turbo).

 

[Diamond Star Werks]

Yes, i did mention that. I was just adding the info for any possible future investigators reading this thread.

 

[portum89]

First check with a voltmeter the output voltage from the alternator, from the bolt that it has to a ground on the bay, it should be somewhere around 13.6 or so....if its like 12v then its not charging. Then Check with your voltmeter at the battery and car running how much voltage there is. If it is like 12v then its maybe in the wiring... your belt tight?