Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

What connector is this?

Old Oct 3, 2020 | 12:10 PM
  #1  
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From: Cranbrook
Car: 1985 camaro z28
Engine: 5.0l LQ4
Transmission: 700r4
Axle/Gears: 383
What connector is this?

Sorry for the stupid question but I noticed a connector in-line from the positive battery connector to the positive terminal on the alternator. It's close to the battery side, I can't figure out if it's supposed to be plugged in somewhere.

Have been having trouble with the alternator charging the battery, ordered a new alternator but now I'm thinking this plug could also have something to do with it?


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Old Oct 3, 2020 | 12:51 PM
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From: Colorado USA
Car: '83 Firebird (T/A Clone)
Engine: 350 with L-69 components
Transmission: 700R-4, 2000 RPM stall converter
Axle/Gears: 10-bolt/3.73 ..
Re: What connector is this?

Is the other end coming from the alternator?...
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Old Oct 3, 2020 | 12:53 PM
  #3  
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From: Cranbrook
Car: 1985 camaro z28
Engine: 5.0l LQ4
Transmission: 700r4
Axle/Gears: 383
Re: What connector is this?

Originally Posted by T.L.
Is the other end coming from the alternator?...
Yeah one end from the positive terminal on the alternator the other end is the positive battery cable. Can't seem to find anywhere it's intended to be plugged in.
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Old Oct 3, 2020 | 04:01 PM
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Re: What connector is this?

Looks like the ECM power plug.
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Old Oct 3, 2020 | 05:15 PM
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From: CT
Car: 1984 Chevrolet Camaro Z28
Engine: 5.0 Liter 4-BBL V8 High Output
Transmission: 5-Speed Manual
Axle/Gears: 3.73
Re: What connector is this?

Originally Posted by sofakingdom
Looks like the ECM power plug.


Plugs In Here Runs Up To A Main Wire Loom.




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Old Oct 3, 2020 | 05:27 PM
  #6  
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From: Cranbrook
Car: 1985 camaro z28
Engine: 5.0l LQ4
Transmission: 700r4
Axle/Gears: 383
Re: What connector is this?

Originally Posted by gt4373


Plugs In Here Runs Up To A Main Wire Loom.

Whats really odd is I don't see the other end of that plug anywhere, will my car have an ECM if it's carb not TPI?

Made a video to show:
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Old Oct 3, 2020 | 09:03 PM
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Re: What connector is this?

Would have had an ECM at one time. Every one of these cars for US sales did. Who knows what some hack hacked out of it when they did the other hack. Although if your car came with a carb, 82087 LG4 or L69, it could conceivably have had both a carb and an ECM, with that connector in use.
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Old Oct 3, 2020 | 10:19 PM
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From: Cranbrook
Car: 1985 camaro z28
Engine: 5.0l LQ4
Transmission: 700r4
Axle/Gears: 383
Re: What connector is this?

Originally Posted by sofakingdom
Would have had an ECM at one time. Every one of these cars for US sales did. Who knows what some hack hacked out of it when they did the other hack. Although if your car came with a carb, 82087 LG4 or L69, it could conceivably have had both a carb and an ECM, with that connector in use.
I was told the car is all stock, the radio was swapped to a modern deck by the previous owner but like you say who knows what kind of hack job they did.

If they did disconnect the ECM power supply would the car still run properly?
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Old Oct 4, 2020 | 07:25 AM
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Re: What connector is this?

If it has fuel injection it wouldn't run at all.

If it had the computer-controlled carb it would run terrible and probably consume fuel measured in gallons per mile instead of miles per gallon.

A photo of the engine with the air cleaner removed, if it has one, would help identify what you have.
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Old Oct 4, 2020 | 09:34 AM
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From: Cranbrook
Car: 1985 camaro z28
Engine: 5.0l LQ4
Transmission: 700r4
Axle/Gears: 383
Re: What connector is this?

Originally Posted by sofakingdom
If it has fuel injection it wouldn't run at all.

If it had the computer-controlled carb it would run terrible and probably consume fuel measured in gallons per mile instead of miles per gallon.

A photo of the engine with the air cleaner removed, if it has one, would help identify what you have.


hard to make out but the number stamped on the carb is 17085582 1225 HZN.

From what it looks like I could have a M4ME carb? If it has no electronic control would it still come with that wire from the factory just not hooked up to anything?
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Old Oct 4, 2020 | 09:56 AM
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Re: What connector is this?

Yup, M4ME. That designation means a Modified model 4M (Q-Jet) with Electric choke. Looks like the export model; can't recall what the RPO was, but basically, it's the LG4 with no computer. US cars got the E4ME; Electronically controlled, model 4M (Q-Jet), Electric choke.

The reason it came with that wire from the factory is because it's eeeeeeeeeeezier and cheeeeeeeeeeper in a factory to have one extra little bit of nothing like that for just a handful of cars, than to keep up with 2 different parts that are exactly the same except only slightly different and then keep up with which cars get which one. If the split was more nearly half-and-half they might have bothered. But for the tiny minority that went to Canada it wasn't worth it.

You'll find it'll run AHELLUVALOT better if you advance the timing (rotate the distributor body CCW) about 10° from where it is now. Put it to where the plug wire towers look straight rather than twisted slightly clockwise like it is now. Mark it of course so you can put it back if you don't like the extra power, throttle response, gas mileage, and cooler running that you'll get from TUNING the car.
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Old Oct 4, 2020 | 10:06 AM
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From: Cranbrook
Car: 1985 camaro z28
Engine: 5.0l LQ4
Transmission: 700r4
Axle/Gears: 383
Re: What connector is this?

Originally Posted by sofakingdom
Yup, M4ME. That designation means a Modified model 4M (Q-Jet) with Electric choke. Looks like the export model; can't recall what the RPO was, but basically, it's the LG4 with no computer. US cars got the E4ME; Electronically controlled, model 4M (Q-Jet), Electric choke.

The reason it came with that wire from the factory is because it's eeeeeeeeeeezier and cheeeeeeeeeeper in a factory to have one extra little bit of nothing like that for just a handful of cars, than to keep up with 2 different parts that are exactly the same except only slightly different and then keep up with which cars get which one. If the split was more nearly half-and-half they might have bothered. But for the tiny minority that went to Canada it wasn't worth it.

You'll find it'll run AHELLUVALOT better if you advance the timing (rotate the distributor body CCW) about 10° from where it is now. Put it to where the plug wire towers look straight rather than twisted slightly clockwise like it is now. Mark it of course so you can put it back if you don't like the extra power, throttle response, gas mileage, and cooler running that you'll get from TUNING the car.
Wow thanks for all the help!
Once I get the alternator put in I'll try rotating the distributor, I haven't driven the vehicle enough to see a before and after but if it will have that many positive effects to advance the timing than why not give it a shot

One more question for you, the carb looks pretty dirty, would it be worth while to take it off and clean it up? I haven't done that type of thing before but it looks like it should be pretty straight forward, unbolt, douse it in carb cleaner etc, reboot with a new gasket?
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Old Oct 4, 2020 | 02:39 PM
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Re: What connector is this?

There's a little more to it than that... the dirt on the outside is insignificant, it's what's inside that counts. There's ALOT of little parts and pieces in that carb, all of which have to be taken apart, cleaned up, reassembled, and readjusted. One step at a time: get the car running first, go from there.
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