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ok that plug and the one next to it i put the red in where the yellow wire is and the black end went to the neg side of the battery. ok then when i connected the two yellow wires from each plug together i got some numbers to appear on the multimeter thing. anywhere from 180-150 ohms.

ya dave its the 280zx 60amp alt. i checked for resistance and seem to have nothing. maybe i did it wrong. i can take pictures of where i connected it if you would like. actually i may just do that. give me a few for that. but there was a time that i had been messing with the fuel relay (the big one under the dash) i replaced it with a newer relay and on that it has a yellow wire. are they connected somehow? cause i do remember that one time i had hooked it up a little wrong and the wires got hot. maybe it sent it all the way to there? but then again maybe not. however after taking my datsun to doug at crawfords he unhooked the inline fuse and its been using the mechanical pump ever sense. oh and thanks for that fuseable link help. haha i feel dumb now. but now i can look into the upgrades for that and modernize it a little.

alright sounds good. i will check that here in a min i gotta find my multimeter tool. also just while im at it. here is a picture of the starter area where im told the fuseable link is located but i cant seem to find it or maybe im looking for it but it doesnt look like what i think it should look like. anyways heres the pic.

ok will do. this may sound dumb but how or like i guess where should i connect the ohm meter to the alt to check for resistance on the alt? well its a multimeter i should restate that.

and heres a link to the upgrade too Dave's 1972 Datsun 240z: Alternator Upgrade

yes the yellow wire and the used to be while wire next to it were connected. thats how the DIY said to do it too.

heres what i did. i had a tach that didnt work. so i installed a blaster 2 coil. the 280zx dizzy. i forgot if it was the turbo kinda or non. i believe non. then installed the 280zx tach with the 240z face. and what do you know it started to work. Now my car is the 6/73 so it had a three wire system. i assume you had the 4 wire system. beermanpete helped me out too! great help.

so i followed the instruction on the alt upgrade and it all works and worked well. however today after starting it up and i finally got the heat going! i noticed the plug with the diode looked funny. heres a picture, any ideas on what may have caused this? it was running before i took the tape off and ya. heres the pic. almost forgot, another question is where or what is the second ground wire for on the climate controls? heres a picture. i found on what the one on the left side was for. the right side i dont know. also im gonna add that the design of these things and taking them apart and putting back together was not well though out. having the screw in the back and reaching around n stuff. man a PITA for sure. well thanks for the help guys. mainly worried about the first part of this post. ok heres the picture.

What year and month was your z made.? Mine was 6/73 and it was the three wire tach style. Had me confused for the longest time. There is a thread on here on what I did as well and a thread about swaping the tach too.

Ok, got the 280z tach, swapped its guts to my 240z tach. it works!!!!!!!!! well anyways, i now can tune the carbs! cause the tach works. haha. thanks for the help beermanpete! also i hope this thread helps others. if anyone needs pictures ill post up what i can.

ok thanks, ill give it a try when it arives and let you know how it goes. Thanks again for the help.

Alright, ive installed the 280zx dizzy. It starts and runs and sounds pretty good. I followed the wiring from this where it talks about getting the tachometer to work with early z's. http://atlanticz.ca/zclub/techtips/distributor/index.html The tachometer still wont work. I have a three wire tachometer. Ive connected the GW and BW wire together and put on positive side. Also there is a wire coming from positive side to the e 12 80 and the neg side to the e 12 80. Is there something else i have to do sense its a three wire tachometer? I also have bought a 280z tach from someone on hybridz. will be here in the next few days. Ill try that one to see if it works or not. ide like to keep the orginal z if at all possible. heres an overview of it all. close up of the e-12-80 the black wire is going to the neg side of coil. and the grey wire is going to the positive side here is the coil side of it all.

Ok, i think i get it. my z actually has a working electric fuel pump with stock wiring, however what i dont like it when i turn it to acc the pump it on. I hope to fix that with the oil pressure switch. Yes i enjoy your blog very much! thanks again for doing that!

I have a 6/73 240z, perhaps they changed it over for the later models and so on to the 260z. I have found this post cause when you pointed out that i have a three wire tach i went to good ol google and did a search. this is what i found. Tachometer - Page 3 - Ignition and Electrical - HybridZ however after reading it i dont think the guy came to a conclusion, or if he did, he didnt post how he solved it. Im going to wait till I do the 280zx dizzy conversion to mess with the tach a little more, however i will hook that black wire i cut back up. ha. by the way according to autozone they should have the dizzy in on the 6th. Also beermanpete, THANK YOU FOR HELPING ME WITH THIS!!!! I feel like im on the way to solving this issue. and im going to document it on here for many other to hopefully search and find. I do wonder when they decided to switch the 240z's to three wire? oh well.

Sp just a little while ago I disconnected the black wire from the harness, now it just goes from the - neg side of the coil to the points on the dizzy. The tach did not work still, which i expected but it didnt change anything either. I have some pictures I am uploading. In these pictures you will see i have changed the coil with another one. Its name and brand are unknown. The guy i got it from said it might or might not be an orginal z coil. but sense the tach still did not work i believe it to not be an orginal z coil. Anyways here are the pictures, i apologize for the messiness. When i get the 280zx dizzy and install it, and try the dizzy upgrade ill let you all know if the tach starts to work. another question that poped up, there was a BY wire. this comes from the ignition? well anyways i believe it to be a hot 12+ wire. as i tried to hook it up to the coil and it started with it hooked up. it was just a simple test so right after it started, i turned it off and unhooked the wire from the coil. Plug that goes to the back of the tach. Back of the tach Ignition switch plug coil and its wiring.