New PIAA Lights.. Problems.... Ahhh!!

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Apr 1, 2006
Dallas, TX
Hey guys,

I just installed a set of PIAA 510 drving lights on my ARB. I wired them up as instructed by Slee...

Battery hot into relay
Driving lights into relay

Interior Switch power into High beam red and blue wire
Ground from relay into high beam red and yellow.

Now the switch powers the light when the headlights are on....

BUT..... my high beams come on automatically when I turn my Low beams on...... I have high beams anytime I basically turn the headlights on....

Any ideas?
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Since you have "HID" headlights in your sig - anything get changed before this wiring-wise?

I havent installed my HD retro fits yet.. in fact the guy from HID Planet is still updating them :(

As for the driving lights, I couldnt find a way to get the slee recommended setup to work.. the moment I tapped the negative wire into the high beam red/ yellow my high beams come on, regardless of if I actually turned the high beams on...

anyway I just tied the relay ground into the battery negative terminal and kept the relay switch tapped into the red/blue from the highbeam headlight and everything works. My driving lights dont come on automatically when I hit the high beam but they do come on when I hit the interior switch and they shut off when I turn off the headlights.....
At least my high beams arent stuck on anymore!!!!
here are some shots

the 1st one shows the relay that came with the lights.

from that relay I ran a hot to the battery (white wire)- shown in 2nd pic. this was per the PIAA instructions

The 3rd pic shows the ground from the relay to the battery negative.
I previously had this tapped into my highbeam red/ yellow ---- but when I hooked it up this way my highbeams light stayed on anytime my headlights were on. Somehow it seems the ground wire trips the headlights into highbeam mode......

the 4th pic below shows the white wire (interior switch wire) that runs from the relay to the interior switch and then I tapped it into the red/blue wire on the highbeams.

Final pic shows the wires for the interior switch run into the firewall.

So to summarize the PIAA relay has 4 wires running out of it...

The thick white hot wire I used to connect to the battery positive terminal. (-per PIAA instructions)
The thick black wire I connected to the battery negative. (-per PIAA instructions)

There is a black set of driving light wires that I connected to the driving lights (duhhh ....)
Finally there is the interior switch wire which runs out of the relay to the switch then out to the highbeam headlight red/blue wire

I originally had the ground from the PIAA relay run to the highbeam headlight red/yellow wire but that kept my highbeams on anytime I had the headlights (low beam) on.....

Thinking I might have tapped the wrong wires on the highbeams, I also tried to switch the ground wire from the relay to the red/blue on the headlight and the white interior switch wire to the red/yellow on the headlights but that causes the headlight fuse to blow...

My driving lights work now but they dont come on automatically with the highbeams. When I turn the interior switch on, the driving lights come on with the low beams, turn off when I hit the high beams and turn off when I turn the low beams off.

When I leave the interior switch off, the driving lights dont come on automatically with the low beam or with the high beams...

I also cannot turn the driving lights on unless the headlights are on....

Is this legal in Texas?

any thoughts?
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seems a previous owner did some wiring on your truck??

why do you say that?
You should be aware that Toyota switches the negative feed to the High and Low beam filaments and the common on both beams bulbs is a positive feed unlike any other vehicle.

Which mean that when you have your high beam on, you will have only a negative or ground signal to activate your PIAA lamps switch and they came standard to be controled by a +12 volt signal as the rest of car manufacturers use !!!!

Problem you have is that the negative black wire which as per PIAA instructions should go to the vehicle ground or negative battery post is providing ground to the lamps AND the PIAA relay coil.

I don´t have a harness in hand but you should find a way to separate the negative ground that goes to the lamps from the negative that goes to feed the PIAA relay assembling. Once you isolate this relay negative ground, feed it with the high beam negative out when the highs go on and the white wire that goes to the switch should be hooked to the positive common wire that feed both the high and the low beam bulbs. The older PIAA relays were a inline type having 2 plugs with 2 wires on each one, on each side and a circuit board inside to were the relay was soldered and on them it was not easy to isolate the coild. I don´t see clearly your relay picture but looks like all the wires came from under the relay. If you have this type I guess you should cut about 2" before the relay the two black wires that end together in one of the female blade plugs (one of the black came from the battery and the other black goes to the lamps) splice and solder them together and put tape, Now you will need only one of the remaining black wires that goes to the relay: this is the wire that will provide negative to the PIAA relay coil and you should hook it to the high beam wire which have negative when you have your highs on.

By the way the PIAA in dash switch which came with the lamp is a oval one (hold by a two side tape to the dashboard) with a square or rectangular push button and a led which changes from green to red when the lamps are on ?
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thanks for the reply... but I am a little confused...

Basically I only need to change the ground wire setup.

I take the ground off the battery negative.

I am confused on what to do with the black wires on the relay. 1 set comes from the driving lights and the other black wire is the thick back ground wire.
Not sure what you mean by cut the wires, solder them, etc...
Can you clarify for us non electrical types?

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