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1981 280zx grounding issue....

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Old 04-23-2012, 10:44 PM
  #26  
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Originally Posted by RB26
there is a black wire bolted to the back of my alternator .
which is good.. lol..
but i am refering to a black wire connected to the engine block . follow your heater hose that runs along the side of your engine from above the alt to near the starter it will be bolted to a bracked holding the hose about half way between the two . if you cant find it ill post a pic tomorrow for sure.
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Old 04-24-2012, 02:21 PM
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ok so i got the new alternator today and i was wondering what guage my ground wire is and which one to replace. the large white one or the large black one?
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Old 04-24-2012, 03:42 PM
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yeah im gonna need a pic cause i have no idea what your talking about....i dont see any black wires or hoses above my alternator along the side of the engine block. this wire that your talking about...is it the ground for the alternator?
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Old 04-24-2012, 05:28 PM
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Can't upload pics from BB dude ill put them up once I get home around 12 oh and ima show you 2 grounds that are both attached to that harness. does ur car fry the wire when the keys turned to"on" ,"acc", or when you start the motor?
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Old 04-24-2012, 05:56 PM
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these two grounds both come from the same harness as the alt to fusible link connection. one is above oil pressure sensor the other is located on the negitive battery cable
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Old 04-24-2012, 06:01 PM
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the grounds

srry they didnt upload, here you go buddy.
Attached Thumbnails 1981 280zx grounding issue....-zground1.jpg   1981 280zx grounding issue....-zground2.jpg  
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Old 04-24-2012, 06:51 PM
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i remove both the positive and negative battery terminals before i replace that wire in the fuseable link box....then i reconnect the negative terminal and when i place the positive terminal on the wire fries. i dont even get to connect the battery and put the key in before it blows out.
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Old 04-24-2012, 06:55 PM
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my negative terminal looks like yours but my ground above the oil pressure sensor doesn't. my wire runs up to that bracket and is bolted to the outside of it and not directly to the engine block like yours.
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Old 04-24-2012, 07:05 PM
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Originally Posted by RB26
i remove both the positive and negative battery terminals before i replace that wire in the fuseable link box....then i reconnect the negative terminal and when i place the positive terminal on the wire fries. i dont even get to connect the battery and put the key in before it blows out.
Did you take all the fuses out of the fuse block before you hooked it up?
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Old 04-24-2012, 08:10 PM
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what does that do if i dont remove the fuses? and do i remove the fuses then hook the battery up, then replace the fuses?
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Old 04-24-2012, 08:40 PM
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removing all the fuses will allow you to one by one inspect and put the fuses back in thier place to see if one of them frys the wire upon being put back in. this will allow you to narrow down the search for your problem.
1)be sure to unplug the negitive cable from batt,
2)put the fuse link in,
3)unplugg suspect wires (ALL FUSSES)
4)put neg cable on see if the wire frizzles
5)if not then start to put wires(FUSSES IN) back together one by one following steps 1,2,and 4 always unplug neg before connecting wires because the wires you are connecting can become hot and burn you
same test as this one but for the fuses instead of the wire connctions
you may not have to unplug the battery for this one but as always use caution when playing with lightning.
did you get a new alternator yet???

Last edited by koprutzxt; 04-24-2012 at 08:42 PM.
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Old 04-25-2012, 05:48 AM
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yeah got the new alternator...putting it in this morning. ill let you all know how it goes.
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Old 04-25-2012, 09:09 AM
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ok so there are two plug ins on the back of my alternator but i only have one clip down there...what do these plug ins go to?
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Old 04-25-2012, 10:06 AM
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the one plug with 2 prongs also known as an 'L' connection goes with the two prong on the harness. do not plug anything into the one labeled "P" you will fry your regulator.. the white wire goes to the "B" and the black wire goes to the "E" for earth
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Old 04-25-2012, 04:26 PM
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wow ..... my old alternator was hooked up wrong. my white wire and black wire were hooked to the same bolt. thanks for the advice.
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Old 04-25-2012, 04:50 PM
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Originally Posted by RB26
wow ..... my old alternator was hooked up wrong. my white wire and black wire were hooked to the same bolt. thanks for the advice.
Mission accomplished...

Your old alternator might be good still.
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Old 04-25-2012, 06:33 PM
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ok so i've spoken with 2 mechanics and they cant tell me what that cylinder peice is on the back of my alternator or what it hooks to. If anyone has any idea then let me know please and post a pic if possible. Heres a pic of what im talking about and my new one has an O ring connection on it instead of this male end connection like the one in this pic of my old alternator.
Attached Thumbnails 1981 280zx grounding issue....-2012-04-25-20.23.12.jpg  
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Old 04-25-2012, 07:42 PM
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here is your answer to the "cylinder", i explained earlier
cut and pasted below

about the broken white wire: The little battery looking thing on the back of the alt. is used to keep static from the alt from effecting your stereo reception.
On new alts. they are mounted on the back and connects to the "B" space on the alt along with the large white wire.
now, that little wire used to have a butt connection that would connect to the battery static thing on the stock alternator only. its cut on mine and in not used in any zx with a new alternator.

so did the wire fry with the alternator????
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Old 04-25-2012, 08:30 PM
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Originally Posted by koprutzxt
here is your answer to the "cylinder", i explained earlier
cut and pasted below

about the broken white wire: The little battery looking thing on the back of the alt. is used to keep static from the alt from effecting your stereo reception.
On new alts. they are mounted on the back and connects to the "B" space on the alt along with the large white wire.
now, that little wire used to have a butt connection that would connect to the battery static thing on the stock alternator only. its cut on mine and in not used in any zx with a new alternator.

so did the wire fry with the alternator????
Its actually a noise supression cap for back EMF from the collapsing magnetic fields and brushes in the alternator. There isn't any "static" noise. It helps keeps EMI from the radio and your ECU....
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Old 04-25-2012, 08:56 PM
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thanks for the info fic frac.. i donk know if any amount of years , work, and research on the z's will ever wash away grandpa's gaurage teachings lol
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Old 04-26-2012, 05:20 AM
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so does the wire from that cylinder still connect to the battery connection on the back of the alternator?
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Old 04-26-2012, 06:16 AM
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yes, my advise just hook up the white wire, the L connection , and the ground. nothing else you should be fine.. we need some results oon the progress of hat wire..
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Old 04-27-2012, 05:33 PM
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Holy SH*T....fuseable link box didn't blow when i connected the battery and my freaking everything works again. Very much man love from me to you guys for helping me solve this issue!
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