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Car Forum / Dodge / Dodge Trucks / August 2007Color codes alternator wires
I posted this in rec.autos.tech and either they think their too smart to answer or they don't really know. Old dodge van, 70's vintage. Alternator wires from back view, two small gauge ones, one is green other red. Two terminals one at 11 oclock one at 2 oclock. Where does the red go and the green? Please don't make me call the dodge dealer for this, haha. They probably didn't answer because you didn't give enough information. Exactly what year and size alt. Different years use different color wires but in this case, I don't think that it really matters and the field wires should be interchangeable.  SignatureIf at first you don't succeed, you're not cut out for skydiving > I posted this in rec.autos.tech and either they think their too smart to > answer or they don't really know. [quoted text clipped - 3 lines] > at 2 oclock. Where does the red go and the green? Please don't make me > call the dodge dealer for this, haha. >the field wires > should be interchangeable. He didn't like that answer. >>the field wires >> should be interchangeable. > > He didn't like that answer. Nope, just being careful, don't want to blow something and spend more money if you are wrong. Autozone says the red goes closest to the power wire which is still attached to the alternator. It does not make sense they would colorize the wires if there was not a specific terminal to which each goes. If it turns out you are right you have my apologies. > >>the field wires > >> should be interchangeable. [quoted text clipped - 6 lines] > they would colorize the wires if there was not a specific terminal to > which each goes. If it turns out you are right you have my apologies. As I've explained before; the red wire is 12 volt key on, the green wire goes back to the voltage regulator where it is pulled to ground to complete the saturation of the alternator field. Since the two wires perform entirely different functions as noted above, it makes perfect sense that they'd be different colors. The autozoo diagrams do not specify which terminal gets which color wire, their diagrams are simple block diagrams. If it mattered, the terminals wouldn't be the same and they'd be marked. (as GM did, as Ford did, etc.) Understanding HOW the circuit works negates any notions you may have regarding 'they must be different, there's different colored wires.' The field circuit is totally isolated, that's why it's called an isolated field circuit. Matters not which terminal gets either color wire. Prior to 1970, you'd have a point (of sorts). I can see that. Whether he likes it or not, it is what it is. SignatureIf at first you don't succeed, you're not cut out for skydiving > > >the field wires > > should be interchangeable. > > He didn't like that answer. > They probably didn't answer because you didn't give enough > information. Exactly what year and size alt. Different years use > different color wires but in this case, I don't think that it really > matters and the field wires should be interchangeable. Sorry, it is a 77 b-100 1/2 ton tradesman van. I think the alternator is the smaller 65? amp one, double grove pulley. Does that help? I guess I really do not understand why they color code the wires if they are interchangeable and seems I remember something about "polarizing" the alternator which would, I'm guessing, imply they are not? > > They probably didn't answer because you didn't give enough > > information. Exactly what year and size alt. Different years use [quoted text clipped - 6 lines] > interchangeable and seems I remember something about "polarizing" the > alternator which would, I'm guessing, imply they are not? They are color coded because they do different things. One is the 12V feed wire and the other is the ground which is controlled by the regulator. If they were the same color, it would be near impossible to diagnose a wiring problem with the alternator. The alternator in your vehicle has isolated field windings and as such, the wires are interchangeable. If they needed to be connected to a specific terminal, the connectors for each terminal would be different and the two wires would only fit one way. SignatureIf at first you don't succeed, you're not cut out for skydiving > > > They probably didn't answer because you didn't give enough > > > information. Exactly what year and size alt. Different years use [quoted text clipped - 14 lines] > to be connected to a specific terminal, the connectors for each terminal > would be different and the two wires would only fit one way. 'isolated' had nothing to do with it, ignoramus POLARITY is what matters glad to see you're still around spouting off your stupidity, and that it's still very easy to bitch slap your ignorant a.s into next week > > > > They probably didn't answer because you didn't give enough > > > > information. Exactly what year and size alt. Different years use [quoted text clipped - 17 lines] > > 'isolated' had nothing to do with it, ignoramus LOL, once again, you show your brilliant intellect and that astonishing single digit IQ. > POLARITY is what matters Really, please explain the polarity on an AC device. Now, you do know what AC means, right?!?!?!?!?! > glad to see you're still around spouting off your stupidity, and that it's > still very easy to bitch slap your ignorant a.s into next week LOL, I do find it funny to watch the stupid and the ignorant pat themselves on the back for the great job that they believe that they have done when in reality, ail they have done is screw the pooch and the rest of us either laugh or just feel sorry for them or in this case, you. SignatureIf at first you don't succeed, you're not cut out for skydiving > > They probably didn't answer because you didn't give enough > > information. Exactly what year and size alt. Different years use [quoted text clipped - 6 lines] > interchangeable and seems I remember something about "polarizing" the > alternator which would, I'm guessing, imply they are not? I have a factory service manual for '77 D- W- and S-series trucks. The electrical portion would be the same for your B-series. The 18ga red and 18ga light-green wires feed the alternator field. The red is switched to 12V when the ignition switch is in the "run" position. The green is driven to ground by the regulator, using a PWM (Pulse Width Modulated) signal. The more current required from the alternator, the higher the duty cycle. Because the output of the stator to the rectifiers (inside the unit) is AC, it makes zero difference in the function of the alternator which wire is connected to which terminal (and the service manual makes no distinction). Bryan Ok thanks to you and Tbone for the information. I stand corrected in my assumptions. ;-) >> > They probably didn't answer because you didn't give enough >> > information. Exactly what year and size alt. Different years use [quoted text clipped - 22 lines] > > Bryan > They probably didn't answer because you didn't give enough information. > Exactly what year and size alt. Different years use different color wires > but in this case, I don't think that it really matters and the field wires > should be interchangeable. bullshit hook 'em up one way and it charges, hook 'em up the other way and it discharges try it and watch the f.cking gauge, you ignorant twit > TBone wrote:: > > They probably didn't answer because you didn't give enough information. [quoted text clipped - 8 lines] > > try it and watch the f.cking gauge, you ignorant twit See my previous post. If this was a generator (with a commutator instead of slip rings), reversing the field current would reverse the polarity of the output. An alternator produces AC (into the rectifiers). As such, it makes no difference which way the field current goes, relative to the stator current. My 1977 Dodge Truck factory service manual does not indicate which way to connect the field. Additionally, I've connected isolated field alternators both ways, and it made zero difference in the alternator's performance. Bryan > > TBone wrote:: > > > They probably didn't answer because you didn't give enough information. [quoted text clipped - 20 lines] > performance. > Bryan have YOU tried it both ways and watch the 'ALT' gauge ? I have, and one way the gauge reads to + and the other way it reads to - > > > TBone wrote:: > > > > They probably didn't answer because you didn't give enough [quoted text clipped - 28 lines] > > I have, and one way the gauge reads to + and the other way it reads to - Sure you have, f__king liar. SignatureIf at first you don't succeed, you're not cut out for skydiving > > > TBone wrote:: > > > > They probably didn't answer because you didn't give enough [quoted text clipped - 26 lines] > > have YOU tried it both ways and watch the 'ALT' gauge ? Yes. As I said, it made zero difference in the alternator's performance. You'd have to connect the *output* backwards, in order to create the effect you describe. Since the negative terminal of the output is common to the alternator's case, that would be physically difficult to do. And then, the ammeter would *always* show discharge (even with the engine stopped). The current would be limited by the resistance of the wiring in the charging system, the resistance of the alternator's stator windings, and the forward voltage drop of the alternator's rectifiers. As we say in electronics engineering, it would "let the smoke out". > I have, and one way the gauge reads to + and the other way it reads to - > > They probably didn't answer because you didn't give enough information. > > Exactly what year and size alt. Different years use different color wires > > but in this case, I don't think that it really matters and the field wires > > should be interchangeable. > > bullshit The definition of your general knowledge I see. > hook 'em up one way and it charges, hook 'em up the other way and it > discharges You have got to be the dumbest f.cking retard to ever draw breath. An alternator typically used on American cars is an AC device without a commutator and using a rectifier to create the DC output desired. While switching the field wires will cause the ac signals to shift 180 degrees with respect to the original signals, the rectifier (diodes) still only see an AC voltage and will still direct the positive spikes to the output lug and the negative spikes to ground. Perhaps you are referring to a DC generator that uses a commutator in place of the bridge rectifier where reversing the polarity of the field would reverse polarity but that is not the case with the OP's alternator. > try it and watch the f.cking gauge, you ignorant twit Perhaps you should get you facts straight before making yourself look like the ignorant twit that you are. SignatureIf at first you don't succeed, you're not cut out for skydiving |
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