Wiring spot lights to come on with main beam??

[SUPRASUZUKI]

Has anybody done this on their Supra? Is there a simple wiring diagram available? (It's not as easy as it sounds......):search:

Any advice appreciated.:)

[Guru]

Surely just splice the power going to the main beam and use that for spots too?

[ChrisSZ]

Surely just splice the power going to the main beam and use that for spots too?

:d :d

Find the power wire on the main beams, run this down to the light (I' do one each side rather than two off the one tap personally), earth the negative side and away you go :d

[SUPRASUZUKI]

Neither of these methods work. The spots come on as soon as the lights (low beam) are switched on.
It looks like the high beam is live when the lights (low beam) are turned on, then the high beam earth is switched via relays when the high beam is switched on.

Somehow.:search:

It's all too hard.....:(

[merckx]

You've got to have a power and earth wire running to the main beam bulb, connect the spot lights to these points directly - just before the bulb, at the rear of the headlight unit.

Obviously you'll draw more current through the main beam wiring.

Or do you want to be able to switch them on with the dipped headlights too?

You must live in a very dark place! :d

[SUPRASUZUKI]

I tried this, but the spots still came on with the low beam.
Maybe the spot light bulbs are earthed through the spot light casing as well as the earth wire. :search:

If that's the case I'm fcuked.

I just want the spots on to complement the main beam, not needed with low beam.

Further investigation tomorrow I reckon.:rolleyes:

[merckx]

You'll have to check out the wiring on the spots closer to the bulb and didconnect them from you existing wiring harness.

Very easy really.

[ChrisSZ]

take a separate live feed (direct from the battery to the spots) and splice into the earth of the main beams to the earth on the spots.

I seem to remember Matt Harwood saying that they are switched earths :)

[SUPRASUZUKI]

take a separate live feed (direct from the battery to the spots) and splice into the earth of the main beams to the earth on the spots.

I seem to remember Matt Harwood saying that they are switched earths :)

Sounds about right.
Trouble is, the spots earth through the casing too I reckon, so a direct live feed = spots permanantly on. (I'll check this tonight). I may need to isolate the spotlight casing (after spending all day Sunday making decent metal brackets:rolleyes:).

More to follow......

[tbourner]

If it stops your spots working on their own (without main beam) won't that fail an MOT? As all fitted lights need to be working?

[SUPRASUZUKI]

If it stops your spots working on their own (without main beam) won't that fail an MOT? As all fitted lights need to be working?

I'm not sure what you mean mate? I'll get them working off the main beam somehow. (Fingers crossed:) )

[tbourner]

I thought you were saying you want your fog lights to come on whenever you flash or turn on your main beam? And that would in turn probably mean you can't turn the fog lights on when on sidelights or dipped beam? Which I think might be an MOT failure as they usually stipulate needing all fitted lights to be working (ie: They'll put your sidelights on and try and turn the fogs on and they won't work so you'll fail).

[SUPRASUZUKI]

Yep, you're correct. I want the spots to come on automatically with the high beam.:)

I'm not sure whether an MOT requires spots to work with either main or dipped beam.:search:

I'm sure spots being on in a low beam situation on the road would cause a dazzling hazard:blink:

I'll check the MOT situation.

[JustGav]

Why not have a look closer towards the fuse box side of things where the relays are located, you might find your magic earth that you are looking for.

[SUPRASUZUKI]

Had a eurika moment and sussed it:nana: .

For future reference.

Use a relay, connected thus (assuming the spot light casings are earthed)

85 - main beam earth (blue/red wire)
86 - main beam positive (red/white wire)
87 - feed to spot lights
30 - battery + (fused, 15amp for 55W spotlights)