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Old 12-15-14, 02:11 PM
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need help installing AFTERMARKET amplifier

Old 10-30-13, 05:41 PM
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KiNGD206
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Default need help installing AFTERMARKET amplifier

1990 LS400
aftermarket pioneer double din

aftermarket alpine mono channel amp

i want to install a sub n amp in my car
(done installations to honda civics before so i know the concept)

what i need help on is if anyone got / seen pictures on how to route the wires to the trunk?
like where do the grommets from the engine bay lead to the car etc.?
i remember seeing pictures on google before but cant find it anymore, need help!!!


also, since i dont have stock headunit can i just go ahead and remove stock amp and sub? so its less space
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Old 10-30-13, 06:43 PM
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Originally Posted by KiNGD206 View Post
1990 LS400
aftermarket pioneer double din

aftermarket alpine mono channel amp

i want to install a sub n amp in my car
(done installations to honda civics before so i know the concept)

what i need help on is if anyone got / seen pictures on how to route the wires to the trunk?
like where do the grommets from the engine bay lead to the car etc.?
i remember seeing pictures on google before but cant find it anymore, need help!!!


also, since i dont have stock headunit can i just go ahead and remove stock amp and sub? so its less space
On my '99, there was a grommet straight into the driver's-side footwell, but it's right behind the driver's side, front fender lining. Once you've got the wire in the car, pop the door sills and route it through there, then finally there's a grommet leading straight into the trunk on both sides of the seat edges, though you'll need to move the seat backs out of the way.
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Old 10-31-13, 12:59 AM
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the 1990 one dont, only grommet i see is by passenger firewall, but dont seem to find away through it

i even took out passenger glove box and the underpass, nada ;/

looks like i may just drill a hole, dunno how tho ;/
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Old 10-31-13, 12:45 PM
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it's there, but you have to go through the fender liner. remove the front wheel, remove the fender liner on the driver's side and you'll see the grommet that passes through the firewall.

my thread, though for an air ride setup on a 97, shows how to route the wires with pictures.
https://www.clublexus.com/forums/ls4...tup-ucf20.html
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Old 10-31-13, 02:25 PM
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A 1990 should have a grommet under the drivers seat. That's where I ran my wire in my 92.
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Old 11-03-13, 09:07 AM
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Hope this give you an idea on how/where to run the wire through



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Old 11-03-13, 04:13 PM
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Originally Posted by SynicalVip View Post
Hope this give you an idea on how/where to run the wire through

...I really wish I knew about this during my amp install... But, thanks to you, I now know where to run my 0/1 gauge next time around <3
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Old 11-03-13, 07:20 PM
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Originally Posted by Sc0pe View Post
...I really wish I knew about this during my amp install... But, thanks to you, I now know where to run my 0/1 gauge next time around <3
I didn't run it this way the first time around either until I redid my audio. I will be redoing it again as I need a longer power cord
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Old 11-03-13, 08:23 PM
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Originally Posted by SynicalVip View Post
I didn't run it this way the first time around either until I redid my audio. I will be redoing it again as I need a longer power cord
Yeah, you're run-of-the-mill amp kit won't work on this car haha. For me, I managed with the 17ish feet of wire power wire and 3 feet of ground, but I had to get new RCAs (a 25 foot set of Scosche EFX - WONDERFUL for this car - though I'd say you're good with 20ish feet unless you're really meticulous about running an obstacle course with the wire). When I did my install, I went through that driver's side wiring harness grommet you see toward the top left of the photo. It took me at least 20 minutes to cut a sizable hole for the wire (4 gauge) to pass through.
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Old 11-03-13, 08:47 PM
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Originally Posted by Sc0pe View Post
Yeah, you're run-of-the-mill amp kit won't work on this car haha. For me, I managed with the 17ish feet of wire power wire and 3 feet of ground, but I had to get new RCAs (a 25 foot set of Scosche EFX - WONDERFUL for this car - though I'd say you're good with 20ish feet unless you're really meticulous about running an obstacle course with the wire). When I did my install, I went through that driver's side wiring harness grommet you see toward the top left of the photo. It took me at least 20 minutes to cut a sizable hole for the wire (4 gauge) to pass through.
I'm debating if I should get one longer power cord or just add another amp and then the extended wire on the other side extending it
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Old 11-03-13, 10:34 PM
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Originally Posted by SynicalVip View Post
I'm debating if I should get one longer power cord or just add another amp and then the extended wire on the other side extending it
My advice (also what I'll be doing during my audio overhaul):
  • 0/1 AWG power wire (20 feet color/3 feet black)
  • Knukonceptz KNF-60 Distribution Block
  • 4 AWG (10 feet color/10 feet black)

Essentially, you would be running the (colored) 0/1 AWG from the battery to the block and (black) from the block to the ground point. Then, run the 4 AWG (colored) from the block to both amps' power leads and run the 4 AWG (black) from the amps' ground leads to the block.

Here's a diagram to further illustrate:
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Old 11-03-13, 11:07 PM
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Hmm interesting
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Old 11-03-13, 11:58 PM
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Originally Posted by SynicalVip View Post
Hmm interesting
The way I see it, you spend less on wire (even moreso, if you reuse the 4 AWG wire you ran previously) and you get some "Cool Points" from car audio buffs. The best thing about that distro block is you can fuse each of the cords going to the amplifier as an added failsafe! Not to mention the modular design which allows you to change it to suit your ever-changing build.
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Old 01-21-18, 06:17 PM
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Default Need help have questions about installing system in a 2000 ls400

I have a 2000 ls400 and just bought two 10 inch rockford fosgate p2 punch, a 600 watt rockford fosgate amp and a double din kenwood excelon headunit. So far ive got the wiring harness and double din mounting kit still need to wiring kit i saw on amazon. What else do i need to do since it has the premium system is it difficult to put a system in my friend installing it is not a professional but has installed system in his 2004 Silverado.
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