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Old Oct 25, 2024 | 12:33 PM
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Sound System

1987 F150 4x4 XLT
Hey Y’all so I’m trying to install a new sound system in my truck with new speakers, subs, equalizer, Bluetooth receiver, and an Amp. Problem is I have to run power to the amp and I plan to stick it under my seat so it’s hidden. I don’t see any holes in the firewall I can feed the wire into so it goes into the cab. I’ll drill a hole if need be but then comes the issue of I don’t want to drill a hole and hit something vital. Does anyone got any tips or have done something like this before?
 
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Old Oct 25, 2024 | 01:51 PM
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If you have an automatic, the clutch block-off plate works.
 
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Old Oct 25, 2024 | 02:02 PM
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I ran an 8GA power line into the interior of the truck from the passenger side, behind the kick panel and then under the carpet. It's hard to see in this photo, but there is a plastic mount you can drill for access to the cab. Just be sure to use a rubber grommet where ever you decide to pull the wire through.


Edit: just realized this is for an '87. Got no idea what that looks like. YMMV.
 
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Old Oct 25, 2024 | 03:34 PM
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Originally Posted by Scndsin
If you have an automatic, the clutch block-off plate works.
what do you mean? Drill through that?
 
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Old Oct 25, 2024 | 08:15 PM
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Yeah, if you want. Unbolt, drill hole, add grommet, run wire, bolt plate back in.

Or however you want to do it.

You asked for a safe place to drill a hole in firewall.

I drilled a row of holes, cut it in half, added row of split grommets.

I can take it apart & don't have to pull wires though a hole when I do service on any of the wires going to my fan controls, gauges, FI

 
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Old Oct 25, 2024 | 10:13 PM
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I use the same spot as above for running wiring. Easy spot, run your wires tied up under the dash from there to where ever you need in the cab.
 
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Old Oct 25, 2024 | 11:43 PM
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Originally Posted by Scndsin
Yeah, if you want. Unbolt, drill hole, add grommet, run wire, bolt plate back in.

Or however you want to do it.

You asked for a safe place to drill a hole in firewall.

I drilled a row of holes, cut it in half, added row of split grommets.

I can take it apart & don't have to pull wires though a hole when I do service on any of the wires going to my fan controls, gauges, FI
Can I see this?
 
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Old Oct 26, 2024 | 07:31 AM
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For once, I could find stuff first time out.


 
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Old Oct 26, 2024 | 11:51 AM
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Can you show me where that is? Because when I look it up it just shows me the clutch taken apart and I don’t see anything that looks like that
 
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Old Oct 26, 2024 | 03:10 PM
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It's on your firewall next to the vacuum booster if you have an automatic transmission.
 
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Old Oct 26, 2024 | 03:48 PM
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Why not run your power from up by the battery, down along the frame rail and drill your hole up through the floor? Your probably going to have the seat out anyway to mount the amp.
 
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Old Oct 26, 2024 | 05:29 PM
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Originally Posted by HydroDog
Why not run your power from up by the battery, down along the frame rail and drill your hole up through the floor? Your probably going to have the seat out anyway to mount the amp.
I think the idea is to be less invasive to the cab for water /sound / rust, but i could be wrong. If one was to run a large gauge wire to the driver side and use a junction block, you could just as easily do that at minor added expense, and youre not snaking the wire along the frame or going through a drilled hole in the floor.

 
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