CcSkyEye
Member
Looks great, very clean install!
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2019 Chevy Silverado install
- Thread starter mmckenna
- Start date
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mmckenna
I ♥ Ø
As H2Owl said, there's a nipple on the grommet in the firewall.
You can either pierce it or just cut the end off.
I've put 6 gauge wire through those. Same setup on the Ford pickups. For #6 wire, you may need to use a bit of lube to get it started.
clovisb31
Member
Thanks guys,
I did see that nipple and grommet. When I looked under the dash the area behind that grommet was completely covered by a large junction box...much larger than earlier year Chevy pickups. I really didn't want to remove or disassemble that box from the inside firewall just to see where the back of the grommet was.
Maybe I'm overthinking this as I have used that grommet/nipple on Chevy trucks before , but older ones with more room under the dash, and you could actually see the back of the grommet so you were sure you weren't piercing a wiring harness.
I will try probing through the grommet with a stiff wire or fish tape to see where it comes out inside the cab. I only need to fish a 10 Ga. power lead through there for the transceiver, not a pair of 0 Ga. for a 1 Kw boom box.
I did see that nipple and grommet. When I looked under the dash the area behind that grommet was completely covered by a large junction box...much larger than earlier year Chevy pickups. I really didn't want to remove or disassemble that box from the inside firewall just to see where the back of the grommet was.
Maybe I'm overthinking this as I have used that grommet/nipple on Chevy trucks before , but older ones with more room under the dash, and you could actually see the back of the grommet so you were sure you weren't piercing a wiring harness.
I will try probing through the grommet with a stiff wire or fish tape to see where it comes out inside the cab. I only need to fish a 10 Ga. power lead through there for the transceiver, not a pair of 0 Ga. for a 1 Kw boom box.
mmckenna
I ♥ Ø
Feed the wire through and you'll see it start to appear behind the box. When you get enough in there, have someone help feed it through from the engine compartment and pull on the interior end carefully.
Remember to not use the negative post on the battery for the negative power lead for the radio (it's incorrect in the original photo, fixed afterwards) These trucks have a current sensor on the negative lead from the battery to the body to sense power consumption. Connecting the radio directly to the negative post will bypass that sensor.
Ground the negative power lead for your radio somewhere under the dash board. This will work fine, it also provides a much shorter ground path.
apco25
Batlabs OG
Always a challenge doing an install on a new model. This one, like most full size American trucks is pretty easy.
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I'd ditch those glass fuse holders ASAP and go with a blade type for ATC or ATO. Also heat shrink your crimp ring terminals.
mmckenna
I ♥ Ø
Yep, that's what I usually do, but like I said, it's my dad's truck and he ran the power wire himself. He was happy with it and I doubt he'll change it.
And .. the negative power lead should be connected to the body NOT the negative battery terminal.
Should ground the negative power lead for the radio near the radio to the body of the vehicle.
And ditch those dnang glass fuses. Especially the Chinese ones, and some Jap ones, they are a source of intermittent failures.
Should ground the negative power lead for the radio near the radio to the body of the vehicle.
And ditch those dnang glass fuses. Especially the Chinese ones, and some Jap ones, they are a source of intermittent failures.
mmckenna
I ♥ Ø
Yep, like I said, I advised him of that. This was my dad's truck, and I try not to tear down his own installs too far. It was his truck, just a few days old. He wanted me to assist with the antenna install, but he wanted to do as much as he could on his own. I let him do that, and I made suggestions, but I'm not going to put him down for it. When it fails, I'll help him fix it.
I did move the negative lead to the body after I took the photo.
YEA. very good.
danielhp89
Member
- Joined
- Mar 6, 2012
- Messages
- 10
There is acc power under the dash in a blank acc connector if you want it on with the key, also cont. power there so you don't have to run to the battery. In the 07-18 Silverado,Tahoe, Suburban's the black acc connector box by the brake pedal all had an empty pin that you can get both acc an cont. power from with an insulated female spade connector. I usually use a 1/4" self tapping screw to one of the metal supports under the dash for power.
Antenna looks good. I use a hole saw made for NMO's and rarely ever pull the dome light, just check that my hole isn't going to hit a support brace and measure for center and 16" in from the brake light then feed the coax to one side or the other. depnding on where I am mounting the radio. GM is the easiest brand to put radios in, in and out of the shop in 20-30 minutes depending on if the customer is "helping"
Antenna looks good. I use a hole saw made for NMO's and rarely ever pull the dome light, just check that my hole isn't going to hit a support brace and measure for center and 16" in from the brake light then feed the coax to one side or the other. depnding on where I am mounting the radio. GM is the easiest brand to put radios in, in and out of the shop in 20-30 minutes depending on if the customer is "helping"
mmckenna
I ♥ Ø
I never tap radio primary power into existing wiring. I want clean power off the battery. In larger installs, running a large gauge wire from a fuse/breaker at the battery back to a distribution block at the radios. Clean power, no risk of noise from other under dash taps'
For ignition switched circuits for driving timers or radios with the feature, it's nice to see GM is doing that. Fords have it also and it makes life easier.
For ignition switched circuits for driving timers or radios with the feature, it's nice to see GM is doing that. Fords have it also and it makes life easier.
Project25_MASTR
Millennial Graying OBT Guy
The RAPs (Retained Accessory Power) tap point provided in the GMT900 (2007-2013 GM full-sized) upfitter's guide also strictly states it has an electronic circuit breaker rated at 350 mA. The two newer generations have a RAP 20A fuse that can be tapped (but still only using for ignition sense is optimal).
@danielhp89 You always want to run to the battery. Tapping other sources may work if you're lucky but often leads to issues as the others have described. For futher: Wiring & Grounding
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