Negative switched?????

Submitted: Wednesday, May 06, 2009 at 23:44
ThreadID: 68596 Views:8632 Replies:7 FollowUps:13
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Hi all, i am a little stuck, or confused about wiring spotties with negative switched headlights. I believe that i wire it as follows,

Relay pin 30: Battery power
87: Power to spotlights
85: Negative hi beam wire
86: Positive power from switch

Can someone please give me an idea to what size cable i should be using for pin 85, the earth wire from relay to headlight earth wire. Will be using 6mm twin core for the spotlights so thought the earth should be equivalent of positive wire. Surely i couldnt tap wire of that size into the headlight earth wiring? Can i just earth the relay on its own or does it have to go to the headlight earth wire.

More importantly though does anyone have a diagram or something of how this works as i cant work out how to wire up the switch. I dont get how you get power to the switch without having power there all the time like the headlights do. As i have a light on my switch i dont want it glowing all the time.

Pretty please help me out.
Cheers


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Reply By: Richard Kovac - Thursday, May 07, 2009 at 00:02

Thursday, May 07, 2009 at 00:02
Kroozer

Check out this site Drining lights
AnswerID: 363610

Follow Up By: Richard Kovac - Thursday, May 07, 2009 at 00:05

Thursday, May 07, 2009 at 00:05
or this
super cheap
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FollowupID: 631244

Follow Up By: Lex M (Brisbane) - Thursday, May 07, 2009 at 00:14

Thursday, May 07, 2009 at 00:14
neither of these are negative switched diagrams
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FollowupID: 631246

Follow Up By: Richard Kovac - Thursday, May 07, 2009 at 21:13

Thursday, May 07, 2009 at 21:13
Thanks Lex
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Reply By: Matt(WA) - Thursday, May 07, 2009 at 00:04

Thursday, May 07, 2009 at 00:04
Try this Kroozer

Driving light relay diagram

Matt

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AnswerID: 363611

Follow Up By: Lex M (Brisbane) - Thursday, May 07, 2009 at 00:12

Thursday, May 07, 2009 at 00:12
This is not a negative switched diagram.
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FollowupID: 631245

Reply By: Lex M (Brisbane) - Thursday, May 07, 2009 at 00:11

Thursday, May 07, 2009 at 00:11
try a forum search for "negative switched" (using the quotes).
This has been done to death in the past.

Take the power from the 'headlight on' switch or relay. Not the 'high low' switch. Or from the wire on the headlight that has 12v when headlight on and either high or low selected.

Earth the relay. Wire only carries relay current, doesn't need to be heavy. Negative switched headlights don't have an earth wire, they have a 12v common when the headlights are on. The high or low are switched to earth, hence negative earthed.
AnswerID: 363612

Follow Up By: Lex M (Brisbane) - Thursday, May 07, 2009 at 00:24

Thursday, May 07, 2009 at 00:24
To clarify.

Negative switched headlight.
The common connection has 12v when headlight switch is on regardless of high low setting.
The high beam wire has 12v when on switched low beam and gnd when high beam.
The low beam wire has 12v when switched high beam and gnd when low beam.

12v from headlight common to relay coil via switch. Other side of relay coil goes to high beam wire.

Relay switches 12v from Battery to spots. Use heavy wire and don't forget to fuse it.
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FollowupID: 631247

Follow Up By: Member - Kroozer (WA) - Thursday, May 07, 2009 at 01:06

Thursday, May 07, 2009 at 01:06
I am pretty sure that was what i am after. This is how i take it i would wire it then?

30: Battery power
87: To Spotlights
85: High Beam wire
86: 12v common

Cheers Lex

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Follow Up By: Lex M (Brisbane) - Thursday, May 07, 2009 at 10:58

Thursday, May 07, 2009 at 10:58
looks good to me.
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Follow Up By: Member - Kroozer (WA) - Thursday, May 07, 2009 at 15:42

Thursday, May 07, 2009 at 15:42
Cheers Lex, i could understand your reply. Others just confused the hell out of me.
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FollowupID: 631378

Reply By: tonbon - Thursday, May 07, 2009 at 06:16

Thursday, May 07, 2009 at 06:16
Hi Kroozer, the link below is for upgrading headlights, but i would imagine it could be used for driving lights as well with a minor change.

http://www.danielsternlighting.com/tech/relays/relays.html

Hope it helps, Tony.
AnswerID: 363620

Follow Up By: Lex M (Brisbane) - Thursday, May 07, 2009 at 11:00

Thursday, May 07, 2009 at 11:00
Not a negative switched diagram.
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Reply By: ABR - SIDEWINDER - Thursday, May 07, 2009 at 07:04

Thursday, May 07, 2009 at 07:04
You can use my instructions here.

Harness-pdf

Basically you connect the relays coil (both wires) via a switch to the cars high beam.

Regards

Derek from ABR
AnswerID: 363624

Follow Up By: Lex M (Brisbane) - Thursday, May 07, 2009 at 11:04

Thursday, May 07, 2009 at 11:04
These instructions are not for a negative switched system as far as I can see.
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FollowupID: 631322

Follow Up By: ABR - SIDEWINDER - Thursday, May 07, 2009 at 11:14

Thursday, May 07, 2009 at 11:14
Read the instructions don't just look.
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FollowupID: 631326

Follow Up By: Lex M (Brisbane) - Thursday, May 07, 2009 at 11:39

Thursday, May 07, 2009 at 11:39
Sorry. Missed the last paragraph.
I think that anyone who had to ask how to do this would have trouble following that paragraph anyway.
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FollowupID: 631336

Reply By: Member - Tour Boy ( Bundy QLD) - Thursday, May 07, 2009 at 08:06

Thursday, May 07, 2009 at 08:06
Hi Kroozerwiring

The last post I made shows how I did it and they are used every night since the post. Cheers
Dave
Cheers,
Dave
2010 Isuzu FTS800 Expedition camper
2015 Fortuner
Had 72 cruisers in my time

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AnswerID: 363629

Reply By: ABR - SIDEWINDER - Thursday, May 07, 2009 at 21:46

Thursday, May 07, 2009 at 21:46
Hi Kroozer

Here is a post from last year that has a blow up of my instructions.

ThreadID: 59681

Old-Thread

Regards

Derek from ABR
AnswerID: 363760

Follow Up By: Member - Kroozer (WA) - Sunday, May 10, 2009 at 01:47

Sunday, May 10, 2009 at 01:47
Yeah cheers Derek, that was actually one of my old threads. The wiring diagram doesnt explain which wire of the lights to connect to or anything. Its very hard to follow. Plus i dont get the part with the yellow wire where its dotted and stuff. I actually have 2 of your harnesses but both have given up. First one the switch fell apart, so replaced with a narva switch then the relay went on both of them. Both were hooked up by a Auto sparkie not me, as you could probably already gather. Useless with electrics
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FollowupID: 631778

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