100w Headlights in a brumby?

fitzy03 · Post by **fitzy03** » Sat Apr 29, 2006 3:07 pm

Has anyone changed the headlights in a brumby to 100w lamps. I have bought 4 new 100w lights but cant seem to get the wireing correct. If anyone has had this problem and was able to solve it please let me know.
Thank you

Chris_Rogers · Post by **Chris_Rogers** » Sat Apr 29, 2006 5:36 pm

relay the lot. they switch to ground from memory.

BaronVonChickenPants · Post by **BaronVonChickenPants** » Sat Apr 29, 2006 6:24 pm

Yeah definitely use relays, if you don't it will end in tears

.....and smoke

Jordan.

fitzy03 · Post by **fitzy03** » Sat Apr 29, 2006 7:22 pm

Yer im using them but dont know how the wiring works.

tim_81coupe · Post by **tim_81coupe** » Sat Apr 29, 2006 8:40 pm

The simple way that I'd do it is to run a big (6mm) wire directly from the battery, fuse it at 20A and use that as the power for the relay. The output wire to the headlights would be 6mm as well, you might get away with 4mm. The trigger can come off the old headlight power cable. This is a tad messy but its easy. If I was going to effort for a clean job I'd delete the old headlight wiring and run heavier duty cable in its place

Chris_Rogers · Post by **Chris_Rogers** » Sun Apr 30, 2006 9:43 am

ok I tkae it you have a std 5 pin relay.
do this:

87 - +12 via 30A fuse
30 - to light
86 - +12
85 - old light in.
(swap polarity on 85 /85 if lights are positive.)
you can do it with two relays one high one low. fuse both.
use 6mm cabling to feed them.

tim_81coupe · Post by **tim_81coupe** » Sun Apr 30, 2006 11:51 am

Chris, I know you're an auto electrical bloke and I don't want to step on your toes but....

When I'm wiring spotties or 'headlights on' kits at work I wire the relays slightly different to that.

87 - to light
30 - from battery
85 - trigger
86 - earth.

Chris_Rogers · Post by **Chris_Rogers** » Sun Apr 30, 2006 12:37 pm

yep I wire them backwards..
(bad habit.)

that said when the relay is off there isn't a live pin on it (87a)