Jason81NA,82RBtt Posted July 18, 2001 Share Posted July 18, 2001 Can you tell me how to wire up a Turbo wiring harness to a Non-turbo car's wiring harness? Because my friend and I have put in a zxT motor in his 81 NA. I'm having trouble getting spark,EFI to work, and the fuel pump to kick on. Thanks Jason The more info the better! Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 19, 2001 Share Posted July 19, 2001 I think your best bet is to get the turbo wiring harness. If I'm not mistaken, the connectors on the turbo ECU are different than the n/a. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 19, 2001 Share Posted July 19, 2001 Errr...maybe I need to learn to read first. I thought I read you were just putting the computer in with the n/a harness...doh! When I put mine into my 1st gen, I studied the heck out of the two cars wiring diagrams, and made the appropriate connections. As I recall, I wired the fuel pump signal from the ECU directly to the relay, which was already wired into the rest of the car. I used the trubo EFI relay, and simply wired the old power from the fusible link to it. You may need the turbo coil and trigger -- I don't know if the n/a coil has the external transistor trigger, and you do need that. Good luck, and sorry I jumped the gun. Quote Link to comment Share on other sites More sharing options...
Jason81NA,82RBtt Posted July 19, 2001 Author Share Posted July 19, 2001 I have the turbo coil and transistor, I think that the transistor is bad,If that was bad "and" the rest of the car was wired up right.Would all of the other stuff not cut on because of the tansistor?And does anyone have a transistor that they don't need?? Thanks Jason Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 19, 2001 Share Posted July 19, 2001 You should still get fuel pump action when you turn the key from off to on, unless your EFI relay is not activating. With a bad transistor, you just would not get spark - the fuel and computer still operate. Quote Link to comment Share on other sites More sharing options...
Jason81NA,82RBtt Posted July 19, 2001 Author Share Posted July 19, 2001 Thanks SleeperZ I'm pretty sure that I have a bad transistor. Can you give me the location on the turbo harness and colors of the wires that need hook to the NA car harness.This wiring is something I'm not good at! Thanks Jason Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 20, 2001 Share Posted July 20, 2001 OK, I dug out my old photocopy of the 280ZX turbo wiring diagram. The transistor emitter is grounded throught the chassis, so you don't have to sweat that one. The positive to the coil comes from the ignition switch on a black wire with a white stripe. This same wire powers the relay coil for the EFI relay. The negative side of the coil connects directly to the transistor collector with a short blue wire. The trigger for the whole mess goes through a yellow wire with a white stripe through an 8 pin connector directly to pin 5 on the ECU. Hope this helps. Quote Link to comment Share on other sites More sharing options...
Jason81NA,82RBtt Posted July 20, 2001 Author Share Posted July 20, 2001 If the black/white wire hooks to the - side of the coil, what hooks to the other side of the transistor. On the transistor it has the yellow trigger hooked to one side. What color wire is the "fuel pump signal"? And did you use any of the wires from the turbo harness that was in that five wire connector, that's over near the battery? Thanks Jason Maybe together we can beat this thing. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 20, 2001 Share Posted July 20, 2001 The black/white connects to the + of the coil (positive). The - of the coil connects to the transistor, the other side of the transistor connects to the chassis (ground). I'm at work without the diagram, so I'll get you the color of the fuel pump wire tonight. Not sure about your 5 wire connector near the battery...does it plug into the EFI relay? Quote Link to comment Share on other sites More sharing options...
Jason81NA,82RBtt Posted July 20, 2001 Author Share Posted July 20, 2001 I have just got the fuel pump to kick on.So I think abvout the beat this thing. I'm going to ground the black/white in a few, and see what happens. I still have no injectors working.Is it normal for the ECU to get warm to the touch! Thanks Jason Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 20, 2001 Share Posted July 20, 2001 My 300zx ECU gets warm to the touch with the ignition on, I'm not sure about the 280zxt ECU. I wish I could supply you a drawing - it would be worth your while to dig up the comprehensive Chiltons manual on Z's and ZX's - mine covers '75 though '89, and has all the wiring diagrams. The power to the ignition is the b/w wire connected to the + of the coil. The - of the coil connects via a short wire to the transistor. The transistor completes the current path to the chassis. The transistor (and subsequently the coil) is switched by the y/w wire from the ECU. Regards, Quote Link to comment Share on other sites More sharing options...
Jason81NA,82RBtt Posted July 20, 2001 Author Share Posted July 20, 2001 Would there be spark come from the yellow/white(trigger wire) wire if placed 1/2 cm from a ground, while the key was turning over the motor? Because I unhooked it and there is no spark what so ever.And that is one of the wires "I" know I have hooked up right. How can I tell if I have a bad ECU? Sorry for being so much trouble! Jason Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 21, 2001 Share Posted July 21, 2001 Nope, you'll see no spark whatsoever. The y/w wire is very low current, it's just a signal - it is so weak it can't drive the coil, that's what the transistor does - it amplifies the signal to a current to drive the coil. Even the primary current in the coil won't jump a spark, as it is still just 12V. You can test for a spark only from the plug wires or the main coil wire to the distributor. You could attach a test light from the coil minus (-) to the chassis and the y/w wire to chassis to see if your ECU is putting out the spark signals. Good luck. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 21, 2001 Share Posted July 21, 2001 Ack! You aren't going to ground the black/white wire!?!? That is the power to the coil from the ignition switch, and you'll just blow the fusible link. Excellent you've got the fuel pump going, you are almost there! Quote Link to comment Share on other sites More sharing options...
Jason81NA,82RBtt Posted July 21, 2001 Author Share Posted July 21, 2001 ACK is right! I did ground the black/white wire and smoke came from the transistor! I grounded the short one coming from the transisitor.Where does that one go? Also does your ECU get warm to the touch with just the key on?? Jason Quote Link to comment Share on other sites More sharing options...
Jason81NA,82RBtt Posted July 22, 2001 Author Share Posted July 22, 2001 I'm going to try a test light and see what happens. As for the plug under the dash that plugged into the turbo cars main harness, how many wires do you need to use. As of now I'm just using one, the yellow/white trigger wire. Thanks Jason I think I have gotten the under hood wires done! Quote Link to comment Share on other sites More sharing options...
D83ZXT Posted July 24, 2001 Share Posted July 24, 2001 Hi Jason, I did the N/A to Turbo. (83to83) If your wires are right. The power transistor is bad. Spent many hours learning the wiring. I used the N/A coil wires for the turbo coil. But, added the Y/W wire along with the B/W for the transistor. If SleeperZ hasn't already given you enough help I can send you pics and fax you the factory wiring diagram. Your car will crank but it won't turn over. Been there done that. It took me two nights to figure out why. I put in a new PT and Vroom she went, (this was after getting one from a wrecking yard that was no good) Your looking at $120.- up, for that one little part that prevents it from turning over. LOL.. I remember how frustrated I was. I knew I did it right but she just wouldn't turn over. Donna Quote Link to comment Share on other sites More sharing options...
VinhZXT Posted July 31, 2001 Share Posted July 31, 2001 Wow.. you guys are amazing.. Originally I was going to use the N/A wiring for the swap and then use the turbo wiring for the ECU and coils but there are 6 more wires that needs to be connected to the main loom of wire (N/A) which runs under the dash accross to the fuse blocks. Instead of spend a day or 2 to figure out where these 6 wires goes to I just did a complete swap of all the turbo wirings harness into the car and it took 1 hour.. Obcourse I had everything out of the car already.. If anyone know where those 6 wires go to please give me an email so I can help my friend later on doing the swap and hopefully we don't have to swap all the wirings out. BTW I have another complete set of turbo wiring for the whole car and the wiring harness for the ECU and coils separately. Quote Link to comment Share on other sites More sharing options...
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