disepyon Posted October 24, 2011 Share Posted October 24, 2011 (edited) I am putting a lot of effort in making this thread from taking pictures and trying to explain my self as best as possible, so please help me if you can, i am by no means a wiring specialist but im not an idiot when it comes to wiring something up, i do my research if i need help. First off i bought my 1972 240z a few weeks ago and what supposed to turned out to be a simple radio fix since the radio didnt work turned out to be a wiring job on the dash harness (i.e. figuring out what the previous owners did and going back to fix it). So ever since yesterday i printed off a blown up version of the wiring diagram and started to learn it. I fixed/learned most of the wiring and plugs they messed with but i can not figure out what the wires in the pictures i have posted below go to and how it was wired up originally (this is where i need help). So i am wanting to know based on this diagram how 34(L, blower power),55(R, blower power),54(L,a/c power) were connected before the previous owners hacked into it. I just dont understand why they would mess with those wires to install a radio. The wires i am talking about belong to the blower switch and blower motor harness. Here is a section of the schematic wiring diagram for the blower motor. So based on this, does wires 55 and 34 looking back on the first diagram i posted connect to each other by a 30A fuse? The owners had 55 wired into a frigette auto air conditioner knob, picture below. A/c doesnt work anymore and they removed some ac parts so i just removed this knob since it was pointless to have. Some pictures of the wiring: No sure where this belongs? could be wire 34? pics of the blower harness. So it seems they tap one of the radio harness wires into the a/c power 54 wire L(blue)which comes off the blower switch plug? The other wire from the radio harness seems to go a ignition source from the ignition switch maybe. The red 55 wire coming from the blower motor plug was what i talked about previously that they wired into the frigette knob and i do not know where that connects to originally either. Then there is the blue wire with factory connection plug connected to the red with blue strip(RL) wire that i found like that cut which i do not know where it goes, maybe it is 34? Just for reference the other wires from the radio harness connects to rear speakers that they wired in. When i refer to radio harness i am referring to the aftermarket harness not the original 3 wire radio harness. thanks, Brent Edited October 24, 2011 by disepyon Quote Link to comment Share on other sites More sharing options...
disepyon Posted October 25, 2011 Author Share Posted October 25, 2011 (edited) I worked on the z some more today and pretty much solved two of the wires, but still stuck on one of them which im going to ignore since everything works with out it. So what i thought was wire 34 is actually the illumination light for the stock radio. It ding donged on me that the wire color scheme for illumination is RL (red with blue stripe). Also forgot to look at the stock radio the previous owner gave me to check the wires on there, so that helped a lot. As for the blue 54 a/c power wire, i just put it back to stock and undid the mess the previous owner did. Red wire 55 is the one i am still unsure about. I got the radio working correctly after searching for the schematic diagram for it and found out that the previous owners or the owners before them were idiots and wired it in wrong. So i had to go back and put things back to stock and wire it in correctly. Feels good to get things working correctly and being able to resolve issues Edited October 25, 2011 by disepyon Quote Link to comment Share on other sites More sharing options...
Mikelly Posted October 25, 2011 Share Posted October 25, 2011 Well done... Wiring is not my strong suit... ask Tom Harris... Mike Quote Link to comment Share on other sites More sharing options...
rossman Posted October 25, 2011 Share Posted October 25, 2011 While you're in there you might want to consider ditching the ammeter and adding a couple headlight relays to take load off the 10ga WR wire. Quote Link to comment Share on other sites More sharing options...
disepyon Posted October 25, 2011 Author Share Posted October 25, 2011 While you're in there you might want to consider ditching the ammeter and adding a couple headlight relays to take load off the 10ga WR wire. Hey thanks a lot for that advice. I just did some researching and read up on how dangerous the ammeter is. So ive been reading that some just connect the wr and w wires off the ammeter and connect them. Is that safe? Can i just do that for now until i can get my hands on a 280z fuel/volt gauge later on and wire that up. I found this from rejracer: http://forums.hybridz.org/index.php/topic/99528-240z-charging-system-upgrade/page__p__933113__hl__ammeter__fromsearch__1#entry933113 Very good write up, but i dont have time for that right now as far as putting in a volt gauge. The previous owner been driving the z for about 6 years, you think i really need to mess with this or go ahead and do it for safety purposes? Quote Link to comment Share on other sites More sharing options...
disepyon Posted October 25, 2011 Author Share Posted October 25, 2011 Wow ok Rossman, i just found this link researching on google and it explains in details what you just told me. Although its for a jeep, same concept applies to the z. http://www.drbob.tqhosting.com/tech/ammeter.htm POWER OF RESEARCH!! Quote Link to comment Share on other sites More sharing options...
rossman Posted October 25, 2011 Share Posted October 25, 2011 (edited) Hey thanks a lot for that advice. I just did some researching and read up on how dangerous the ammeter is. So ive been reading that some just connect the wr and w wires off the ammeter and connect them. Is that safe? Can i just do that for now until i can get my hands on a 280z fuel/volt gauge later on and wire that up. I found this from rejracer: http://forums.hybridz.org/index.php/topic/99528-240z-charging-system-upgrade/page__p__933113__hl__ammeter__fromsearch__1#entry933113 Very good write up, but i dont have time for that right now as far as putting in a volt gauge. The previous owner been driving the z for about 6 years, you think i really need to mess with this or go ahead and do it for safety purposes? Yes, you can just cut off the connectors and crimp them together or find a brass bolt and nut and bolt the two connectors together. Make sure you insulate it well and restrain it so it doesn't chafe and short out. It's also important to reduce the load. The full current of the headlights passes thru this wire and the combo switch on the steering column. There are instructions here and on classiczcars.com on how to install two relays for the headlights. If you are not comforatble modifying the wiring harness, you can purchase a plug-n-play relay harness from MSA. The same guy who produces the harness for MSA wrote the how-to on classiczcars.com Edited October 25, 2011 by rossman Quote Link to comment Share on other sites More sharing options...
Miles Posted October 25, 2011 Share Posted October 25, 2011 The member who makes the headlight relay harness is Dave. He has a post in the Vendors section about his headlight harness which is plug and play so you don't have to butcher your wiring. It will allow you to run higher wattage headlights while reducing the load on the light switch. His harness is the one that MSA sells. I bought mine from him directly a few years ago. Takes about half an hour to install. Quote Link to comment Share on other sites More sharing options...
disepyon Posted October 25, 2011 Author Share Posted October 25, 2011 Thanks guys, ill be sure to check on that harness later on. So i worked on the z some more today and everything is working, head unit works, all accessories. Only thing that isnt working is that my radio is not picking up on any fm and am stations. The connection for the main antenna wire is all connected. So i am stumped on why this is happening. could my antenna be bad or my radio? Quote Link to comment Share on other sites More sharing options...
disepyon Posted October 26, 2011 Author Share Posted October 26, 2011 Ok I got it figured out again, answered my own question. I tested my brothers pioneer head unit out and the am/fm stations are working so the antenna is good which means that the head unit that came with the z that i bought is crap. Its a cheap sony xplode radio, so cant expect it to be good quality anyways. Off to the store to look for something decent. Not going to spend a bunch right now, just want radio and usb/ipod hook up. Damn, i havent had this car for a month and its costing me money already!!! Quote Link to comment Share on other sites More sharing options...
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