[OMalley]

Given the wring diagram in the attached image, how would i got about running a third Narva 175 spotlight.

Can it be run off this existing wiring? or do i run another complete wiring setup with separate relay, and switch with just the third light running off it?

Thanks in advance,

O'Malley

[coneykid]

Diagram will work on some cars but not good practice to wire up that way. Don't take pin 85 to frame, take it to the direct opposite pin on your high low bulb. That way it will work on any car.
Why, because some cars are negative switching and some positive. If you take 86 and 85 of the relay off the 2 horizontal pins of your head lamp you'll never have a problem.
If you are running 100w bulbs then use a 2nd relay. Either join pin 87 from old spot light relay, leaving old wiring there, and use it to trigger pin 86 on your 2nd relay. Take 85 of 2nd relay to ground. A 2nd switch to control light can be add either pin.
It's so dame hard to explain something you've been doing for 12 years..

[fordem]

Answering that question without knowing the rating of the relay or the wattage of the globes makes it just a guess - assuming a 30A relay - I would just wire the third lamp in parallel with the other two.

By the way - that diagram won't work with a Suzuki's ground switched head lamps.

[OMalley]

coneykid wrote:

Diagram will work on some cars but not good practice to wire up that way. Don't take pin 85 to frame, take it to the direct opposite pin on your high low bulb. That way it will work on any car.
Why, because some cars are negative switching and some positive. If you take 86 and 85 of the relay off the 2 horizontal pins of your head lamp you'll never have a problem.
If you are running 100w bulbs then use a 2nd relay. Either join pin 87 from old spot light relay, leaving old wiring there, and use it to trigger pin 86 on your 2nd relay. Take 85 of 2nd relay to ground. A 2nd switch to control light can be add either pin.
It's so dame hard to explain something you've been doing for 12 years..

the original 2 Narva's are already wired and working (done by a professional) and it looks as if he has done what you have said with pin 85.
The relay is 12v 30A and Bulbs are 100w.

is this what you mean? (excuse the dodgey photoshop)

[OMalley]

o and there should be an earth on driving lamp 2, it just got chopped off in photoshop.

[JrZook]

100w x 3 = 300W rated at nominal 12volt. Therefore you will be consuming 300/12 = 25amp. Your 30A relay shouldnt have a problem with this. As stated previously just run the third lamp in paralell with the rest.

Dan

[Fatzook]

coneykid wrote:

Diagram will work on some cars but not good practice to wire up that way. Don't take pin 85 to frame, take it to the direct opposite pin on your high low bulb. That way it will work on any car.
Why, because some cars are negative switching and some positive. If you take 86 and 85 of the relay off the 2 horizontal pins of your head lamp you'll never have a problem.
If you are running 100w bulbs then use a 2nd relay. Either join pin 87 from old spot light relay, leaving old wiring there, and use it to trigger pin 86 on your 2nd relay. Take 85 of 2nd relay to ground. A 2nd switch to control light can be add either pin.
It's so dame hard to explain something you've been doing for 12 years..

Or just fit a 40A relay

[got_bar_work]

If u use the existing relay I would put a bigger cable from the bat to the relay
They never put big enough cables in
U want like 6-10mm so u get no voltage drop

[OMalley]

Think I'll just palm it off to the professionals.

[skyman]

Naw mate, your diagram would work fine. No need to pay someone to do it. Just add in another relay like you showed, that way it will hold if you add another light later.

You will also have done it yourself so you will know how to fix it if anything happens down the road, or you want to add more lights (like for backup or side lights).

[Lockie666]

OMalley wrote:

Think I'll just palm it off to the professionals.

NO! Do it yourself, unless you want to waste money. Its so fucking simple.

[fordem]

Bolt the lamp on and wire it exactly where the other two are wired - same wiring, same relay - it really IS that simple.