problem with spotlights

Submitted: Monday, Jun 19, 2006 at 09:51
ThreadID: 35056 Views:3430 Replies:11 FollowUps:2
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Hi
I have just wired up my spotlights & i keep on blowing fuses the spotlghts dont even get a chance to come on before the fuse blows. Hopefully some one can tell me what i have done wrong.

I used a 40amp 5 pin relay
30amp fuse
10 amp switch

The relay #30 wired to positive
#87 wired to pos on one of the lights
#87a wired to pos on the other light
#85 earth
#86 wired to switch then from switch to high beem

Thanks in advance.
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Reply By: Member - Sam (NSW) - Monday, Jun 19, 2006 at 10:01

Monday, Jun 19, 2006 at 10:01
No doubt you have re-traced all your wiring.

what type of lights?

There could be a short inside the light that is causing the fuse to blow.

Also make sure none of the pins/wires on the relay are touching each other. These can easily bend.
AnswerID: 179163

Reply By: Member - Marquis - Monday, Jun 19, 2006 at 10:12

Monday, Jun 19, 2006 at 10:12
You obviously have a short circuit.

Diconnect the lights from the relay (87/87a), check if the fuse blows if the relay is switched on.

If no problems, check the wiring to the lights and inside the lights, make sure there is good isulation all the way (use a multimeter if you have one).
AnswerID: 179165

Reply By: Hairy - Monday, Jun 19, 2006 at 10:16

Monday, Jun 19, 2006 at 10:16
Try unplugging 87 & 87a, turn everything on and test at the relay. If every thing is alright chances are you have earthed out between the relay and your spotlights or have a fault in one of your lights.

Do you have a toggle switch on them and if so is it an illuminating one? If it is is it earthed?
Cheers
AnswerID: 179166

Reply By: hobo - Monday, Jun 19, 2006 at 11:04

Monday, Jun 19, 2006 at 11:04
The spot lights are aaa brand i bought them on ebay,
Iam using a 10amp black toggle switch.
I have tried diconecting one of the lights and it was still blowing fuses so when i get home from work i will try disconecting #87 & 87a

Thanks
AnswerID: 179174

Follow Up By: AS/KS - Monday, Jun 19, 2006 at 17:12

Monday, Jun 19, 2006 at 17:12
I had the same problem,
Turned ont to be a short inside the light..

AS/KS
0
FollowupID: 435522

Reply By: Member - Roachie (SA) - Monday, Jun 19, 2006 at 11:46

Monday, Jun 19, 2006 at 11:46
What sort of vehicle?

We were only talking about this on the weekend (Members Lucy and Pesty were at my place for tea last night......I know, I know, they are both cruiser nuts and you're wondering what the hell I was thinking letting them into my house.......I love a challenge and these 2 blokes are VERY challenging!!! hahahaha)

Anyway, apparently cruisers have their high beam earthed in a funny way..... Postive to earth if that makes any sense!!!

Just a thought.....if your vehicle is a cruiser.

Cheers
Roachie
AnswerID: 179182

Follow Up By: hobo - Monday, Jun 19, 2006 at 12:43

Monday, Jun 19, 2006 at 12:43
Hi Roachie

Its a Gq 2.8td

Thanks
0
FollowupID: 435455

Reply By: drivesafe - Monday, Jun 19, 2006 at 16:18

Monday, Jun 19, 2006 at 16:18
Hi hobo, for a start, you have a changeover relay not a headlight relay.

You can still use it but you will have to bring both driving light power wires off pin 87.

Next try disconnecting pin 86 off the relay and see if you still blow fuses.

If the fuse doesn't blow then before you hook up the wire to the relay again, you will have to work out whether you vehicle has positive or negative switching headlights and the do your wiring for the relay to suite.

Cheers.
AnswerID: 179257

Reply By: fatz - Monday, Jun 19, 2006 at 17:11

Monday, Jun 19, 2006 at 17:11
might find that the headlights are negative switched.........
AnswerID: 179273

Reply By: Gu_Patrol - Monday, Jun 19, 2006 at 17:16

Monday, Jun 19, 2006 at 17:16
Will one spotlight work on it's own
I always use a seperate relay for each spottie, that way you won't have power loss.
AnswerID: 179277

Reply By: OsherG - Monday, Jun 19, 2006 at 20:19

Monday, Jun 19, 2006 at 20:19
Hi there,

I would use two relays for starters and then test the wiring in each lamp. As they are non-branded lamps try replace the internal wiring inside the lamp should be fine after that and then you will only need a 4 pin relay much easier to play with!

cheers
OsherG
AnswerID: 179310

Reply By: arewelost - Tuesday, Jun 20, 2006 at 00:29

Tuesday, Jun 20, 2006 at 00:29
hi
everyone has coverd the main points but your switch is not high enough amperage asuming they are 100 watt lights =200watts

voltage divided into wattage equals amperage
12 200 16.6

i would use a 20 amp switch otherwise it is possible to have a dash fire and take out other wireing in the process and it will happen at night

cheers steve
AnswerID: 179376

Reply By: hobo - Tuesday, Jun 20, 2006 at 06:42

Tuesday, Jun 20, 2006 at 06:42
Thanks to every ones help and tips,

I have tracked the problem & it was a short inside the light itself, i also will be changing my toggle switch to a higher amp switch.

Thanks
AnswerID: 179386

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