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Tahoe Suburban 4 Way Headlights Mod
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mygreengumby
post Apr 14 2006, 10:58 PM
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50 bux?? pssh bought mine for 20 u only need one !!


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Charlie
post Apr 15 2006, 09:46 AM
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I bought mine for $3 a piece...


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mygreengumby
post Apr 15 2006, 04:22 PM
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awesome !! all i had to do it tap 2 wires and thats it !!


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kbnana5
post Sep 5 2006, 03:24 AM
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I have been planning to do this Mod, along with the fog lights with high beams mod, for a while ... and have been trying to put together the supplies. I have not been able to find any 30 amp weather-sealed relays at either Advance Auto or Auto Zone. Still intend to check at CarQuest and NAPA though, the only other chain stores in the neighborhood.

I have found (at www.suvlights.com) some Bosch 30 amp relays, but they're 5 pin: either with a post 87a or dual 87 posts. Do the extra posts make a difference ? Just don't use them ? And am I understanding correctly that they need to be single pole/single throw relays ?

(Haven't had any luck yet finding the T-taps in the right gauge/size either ...) sad.gif


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Scott
post Sep 5 2006, 07:27 AM
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The Bosch Relays are actually preferred. NAPA might be a better for the t-taps. Better yet, consider soldering the connections.


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Charlie
post Sep 5 2006, 07:29 AM
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The extra post allows the relay to function as an "or" relay. 12V is applied to this post "or" this post, depending on the position of the relay.


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Matt
post Sep 5 2006, 07:58 AM
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Are you doing this to the 00 that is in your signature kbnana? If so you can simply ground out a single wire to get the lows to stay in with the highs.

Just curious...


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chuckee98
post Sep 5 2006, 12:32 PM
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The fifth post (87a) is the normally closed position. 87 is the normally open position. When the relay is energized, 87a opens, and 87 closes. An example of where 87a is used is in a starter kill in an alarm application. The starter circuit is normally closed (connected) until the alarm is triggered, and the starter circuit opens up and prevents the vehicle from starting.
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kbnana5
post Sep 8 2006, 07:02 AM
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Okay, so if the only relays I can find are ones with an 87a post or dual 87 posts, it sounds like it'd be better for me to get the dual 87 ones and just not use one of those posts.

Struck out at NAPA Tuesday looking for relays. They didn't have any T taps either.

And yeah, it's the '00 Silverado I'm looking to do the mod on. My '85 Blazer already keeps the low beams on when the high beams are engaged.


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Offtrac
post Sep 25 2006, 10:39 PM
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Hey Scott, Any forthcoming write ups for HI/LOW/FOG/ DRL And Low/Fog/DRL?


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Scott
post Sep 26 2006, 07:31 AM
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All of them are here. 4 ways, fogs and drls. Print them all out and it explains how to integrate together.


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kbnana5
post Sep 28 2006, 05:31 AM
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I had time yesterday to work on the 4-way headlight mod and fogs w/high beams on my '00 Silverado.

I too ran into different color wiring on the low and high beam lamps. Consulted my Haynes manual and it shows the orange wires leading to both low and high bulbs is the positive, so that's what I tapped into. They also were 'hot' when I probed them - with them individually switched on. (Fogs had purple & black, so I tapped into the purple, like the instructions indicated.)

Once everything was wired and tucked away, I thought I'd check to see if it worked before wire tying off the wire loom I tucked everything into. It did ... kind of. The fogs stayed on when the high beams came on, but the low beams went out. Hmm ... Figured I'd better go back and triple check everything.

Switched off the lights and walked back around in front of my truck -- the low beams and fog lights were still on. ?? Yep, the switches were off, but the lights were on. I pulled the in-line fuses and checked that all worked as stock and they did, so that's where I'm at right now.

I am thinking that I actually did the high/fog mod correctly, since it was working, and messed up somewhere with the high/low.

Can anyone tell me what I did wrong ? I checked, checked, checked, and re-checked before connecting any of the wiring to the relay terminals to make danged sure I was following the instructions. The only question I had was the wire colors to the low & high bulbs - both mine have orange, then the high has a yellow and the low has a light green going to them. And as I indicated above, the orange shows on the diagram as positive to both bulbs and were 'hot' with those bulbs on.

I really want to get this done, and done right, so any pointers would be appreciated. Thanks.

-Doug.


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Scott
post Sep 28 2006, 07:39 AM
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Doug,

you have to read this entire thread. The instructions clearly state they are pertinent for 2003+. The earlier models used a different scheme, ground switched. If you read through this entire thread, you will find the answers you seek.


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kbnana5
post Sep 28 2006, 08:31 AM
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Okay. I think I found it. Thanks, Scott...

Now maybe I'll find time next month to un-do the low/high stuff I did yesterday and try it again. At least it seems I did do the high/fogs mod right.

Wasn't it nice when black was ground and color was power and you could just go from there ? wink.gif


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Scott
post Sep 28 2006, 08:44 AM
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Coooool~!

Just remember, even for us seasoned electrical guys, it never hurts to draw out a quick diagram to review and refer to during the install. It's not hard to get things twisted around when you're in the middle of the job.


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mrl112
post Jan 27 2007, 11:10 AM
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Anyone that has done this, please snap a picture of the relay and fuse link, I'm having trouble finding both. No at NAPA, no at Advance, still going to try Pep Boys. Thanks!


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mustgo69
post Jan 29 2007, 08:26 PM
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How about the 2002 version, I did read the whole thread and see that there are some smart guys with alot of knowledge, I just need the SIMPLE 2002 version. Please, thanks!


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blindmouse
post Jan 29 2007, 10:48 PM
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QUOTE(mustgo69 @ Jan 29 2007, 08:26 PM) [snapback]118050[/snapback]

How about the 2002 version, I did read the whole thread and see that there are some smart guys with alot of knowledge, I just need the SIMPLE 2002 version. Please, thanks!


run a simple wire tap from wire location D3 in the gray block under the fuse block (the top-most yellow wire when the fuse block is lifted up from the drivers side, orienting the top of the fuse block towards the engine.) and ground it. done. biggrin.gif

heres a link to the procedure, thanks to bekind. biggrin.gif



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HokieNav
post Jan 30 2007, 05:33 AM
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QUOTE(blindmouse @ Jan 29 2007, 11:48 PM) [snapback]118067[/snapback]

heres a link to the procedure, thanks to bekind. biggrin.gif


I did the same thing on my '01 and it worked like a champ! biggrin2.gif


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Matt
post Jan 30 2007, 07:09 AM
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x2!! I love the mod!!


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Gone but not forgotten...
2002 Chevy Tahoe Z-71 Summit White, 5.3L
mods: Taylor Thundervolts Wires, vent visors, F@rd keys, BFG All Terrain TA ko, Manik Brush Guard, Hellwig front and rear sways, VHT flat black wheel paint

Replaced with 2004 Toyota Land Cruiser all stock
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