DIY MOD: How to make under hood lighting.

gshadow325

New member
Wacky wednesday hump day mod day. something for you to think about doing this weekend! lol

Something that i wanted for a while to do on my own cars. I have done this for many customers before. Most were existing bulbs like in a ford f350 super duty.

So here it is, the magic recipe

-get a mercury switch $3 ebay
Mobilistics Mercury Tilt Switch for Alarms Lights Etc | eBay
-strip leds, i use two 60cm adhesive backed LED strips. ebay has them.
60cm led strip in eBay Motors | eBay
-few small 1/2" self tapping screws
-some wire loom 3-4feet
-some wire about 8 feet
-fuse holder
-ring terminal




i have led strips in stock and have been using this vendor for over 3 years and good quality but expensive. $22 per strip, but they work. consistantly and low failure rate!



enough about the hardware needed. pictures and the how to!

use mercury switch




-Use some alcohol to clean the area on the hood


-YUK the crap that came off the hood.


-clean this area behind the weather strip on the top of the hood but before the hood liner. this is the underside of the hood


-this is the shot of the little tab on the drive's side near the windshield cowl. this tab hold the hood blanket to the hood. there is one on each side of the hood.


-Eventually you will be doing this with the mercury switch and the ring terminal. You will take one end of the two wires from the mercury switch cut it short and attach a ring terminal to it. screw it into the tab like this picture.


-You will run the wires from the led strip light down behind the hood blanket. you will have two wires from the led strip light, one positive and one negative. you will take the negative from the strip light and wire one end to the mercury switch. the other end of the mercury switch will be cut short and wired up to the ring terminal and grounded to the same place where we mounted the mercury switch in the above picture.

-i have the wire running down to the hood hinge on the drivers side. i used some dynamat sound deadening material i have around the shop. cut it into a strip and used it to hold down the power line.


-i ran the wire down to a hole on the hinge and zip tied it. if you look at the passenger side where the washer hose line comes to the hood hinge. you will see what i am trying to accomplish.


-pushed the wire as far back as possible and tucked it under the plastic cowl. wire loomed it and it was coming out from under the cowled, like in the next picture.


-wire come to the fuse and the fuse is tapped into a constant power. the one with the yellow connector on it, in the next picture.


btw- since it is leds, i only used a small small fuse..5amp fuse
Thats it for wiring, since t4r.org only allows for 20 pictures in a post....next post is the money shots!
 
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PICTURES YAYAYAYAYAYA







this is the hieght the hood is set at for shutting the light off


the level of the hood right before the light turns off









Just imagine its pitch black dark as hell out there and you trying to jump start someone elses car. or what ever reason you need the hood open at night time!!

they so bright and awesome!
 
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Looks nice! Definitely on my list of things to do. But I have to say, it would annoy the crap out of me knowing that the light will come on and off during hard acceleration and/or climbing a steep hill, lol. Why not just use a hood pin switch or something?
 
Looks nice! Definitely on my list of things to do. But I have to say, it would annoy the crap out of me knowing that the light will come on and off during hard acceleration and/or climbing a steep hill, lol. Why not just use a hood pin switch or something?

how can you know it is coming on? Can you see in there while the car is moving?

you know you can bend the mercury switch down further so then the light will need to be open much more before it comes on.

hood pin switch would require me to do more work where i dont find it necessary.

By all means you want a hood pin switch, then do it. This is the way i did it and i did a step by step for you to replicate this.
 
Nice.

I did something similar to a previous vehicle I had...found the switch at a local pick and pull yard from another vehicle. Unfortunately, because of regulations, those switches are hard to find now because of the mercury content. Pick and pull yards are required to remove them before setting a vehicle out for parts.

Sorry man, but when I first saw a close up of your insulating mat...all I could think of was 'pubes!' Looks like the thing was made from hair down there..

Starting and stopping should not be a problem...but you have to be careful parking on a steep hill for any length of time. You could put in another switch or relay to override it...
 
Looks nice! Definitely on my list of things to do. But I have to say, it would annoy the crap out of me knowing that the light will come on and off during hard acceleration and/or climbing a steep hill, lol. Why not just use a hood pin switch or something?

these pictures are for you buddy.

where i mounted the mercury switch. it can move and be set to turn on at different anges.

here it is at its most steepest angle. Hood has to be all the way up and on level ground.


hood down a little and its off


up a little from there, its on


i put it back to the way it was before.
 
Nice job. Cool use of the mercury switch - reminds me of the older style thermostats haha.

Thanks for the info on the LEDs too. I plan on doing a similar install but using a hood pin switch or toggle. I still find it ridiculous some vehicles these days don't come with underhood lights - is it really saving automakers that much money?!
 
Nice job, when I first saw your other thread, I was assuming that this was a light unit and that it was what you were mounting, didn't think you'd be doing the mercury level to turn on led's. Very cool idea. Definitely something I will think about doing in the future
 
Nice job, when I first saw your other thread, I was assuming that this was a light unit and that it was what you were mounting, didn't think you'd be doing the mercury level to turn on led's. Very cool idea. Definitely something I will think about doing in the future

for me its a quick and easy mod :)

so i just wanted to share with my 4runner buddies
 
these pictures are for you buddy.

where i mounted the mercury switch. it can move and be set to turn on at different anges.

man you didn't have to go through all that trouble with the updated pics! I believed you that it works just fine, it was just my OCD self speaking before, lol. I know you can't see it at all when you're driving up a hill and all that :)
 
Thats awsome man, Totally understand what a mercury switch does now. I thought you were using it for off road purposes when i saw your hump day post
 
Amazon.com: Magnetic Switch: Car Electronics

could be another option - NC magnetic switch

could be a option but hard part is to align it so that it works properly.

mercury or pin switch is the easiest.

mercury, cleanest, stealiest look

hood pin will take some work to make stealthy and clean

magnetic- in this application, i would not do, unless i cant do the other two. this one is last resort.

not trying to shoot ideas down, just giving my experience with the said switches
 

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