Installation HELP!

[Lmao123 10+ year member]

I bought a new head unit for my car but the harness won't fit. i bought a aftermarket harness and it seens that the head unit wire harness wires are in the wrong places. My car is a 1999 Skyline Gt-R R34. I am wanting to do a solder install. I got all the tools:

Wires spliter

Soldering Iron

Solder

Heat Shrink

Heat Gun.

So am I all set for cutting the head unit harness and matching up the colors with the factory harness? My factory harness has all the wires so I'm planning just to cut and connect.

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[thefordmccord 10+ year member]

Just go buy the correct harness. It will make your life much easier.

 

[Lmao123 10+ year member]

The problem is that the aftermarket wires are in the wrong place meaning that a new harness won't fit. I've already tried. Just tell me if I'm ready to just cut, match wires and solder

 

[LUV2BHATED 10+ year member]

harness would make it a lot easier but since it dont work it looks like u ready to go good luck

 

[phyphoestilic 5,000+ posts]

if ur doing just the head unit and keeping the stock speakers ur gonna need the speaker wiring diagram for the car, but if ur gonna do ur own runs of RCAs from the head unit to amps in the back for speakers/subs then all u need to do is find the ACC, 12v +, Ignition, ground wire (u can probably ground whereever tho), and maybe the antenna. I just cut the harness from the car and tested each wire with car off to find which ones can be the 12v+. Then turn the key to ACC to see which wires had power to find the ACC.

 

[UMGixxer 10+ year member]

well if you have the right wire schematics for your car and the aftermarket harness then you are set to go

 

[phyphoestilic 5,000+ posts]

also pichers of the said skyline.

 

[Lmao123 10+ year member]

Ok I will post pic's of the car and interior when I finish installing. Anyways, what method should I use? Heat the wire and put the solder on the wire and the wire melts the solder or should I use the soldering iron to heat the solder?

 

[UMGixxer 10+ year member]

make sure to unhook neg battery cable first, twist wires how you want them, heat up the solder iron and then put a lil solder on the iron then place the iron under the wire heating the wire then add solder to wire, keep in mind that you should not keep the iron on the wire for a long time

 

[Lmao123 10+ year member]

How long do you recommend holding it on the wire?

 

[UMGixxer 10+ year member]

it should not take but a few seconds since the solder that i told you to add to the iron first will help **** the other solder in

 

[UMGixxer 10+ year member]

do you understand

 

[Lmao123 10+ year member]

Yep. Thanks bro. Also when I cut the factory harness wires off, will the wires still be hot and risk of electric shock even if the negative battery is off? I researched on a website and it it said the +12v wire stays hot even if the cars off.

 

[UMGixxer 10+ year member]

but you have to have a complete circuit i believe for current to pass through the wire, and since you disconnect the neg battery terminal that eliminates that so you only have to disconnect the neg

 

[UMGixxer 10+ year member]

but hell if you want to take the battery out to be 100% safe then go ahead, but trust me the wires that you are cutting will not shock you, i have done this with my battery still hooked up and the only problem was that when i applies the iron to the wire it got to hot and blew a fuse