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Spotlight issues - brighter when applying the brakes?
https://auszookers.com/forum/viewtopic.php?f=5&t=41895
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Author:  Rob` [ Sun Jul 14, 2013 12:02 am ]
Post subject:  Spotlight issues - brighter when applying the brakes?

Hi all, I just had some Lightforce 240 Blitz' installed on my Jimny and I was wondering if someone could help me out?

The issue I'm having is that when I turn on my spotlights they appear to be quite dim. However, when I brake, the lights become significantly brighter and I'm not too sure why... The same thing happens if

I've had a read of this thread: viewtopic.php?f=17&t=1108, but as I didn't install them, I'm not too sure where the issue could be...

Has anyone heard of something like this happening before, or where I should start looking?

Author:  atari4x4 [ Sun Jul 14, 2013 12:17 am ]
Post subject:  Re: Spotlight issues - brighter when applying the brakes?

are they wired through a relay?

Author:  Rob` [ Sun Jul 14, 2013 12:23 am ]
Post subject:  Re: Spotlight issues - brighter when applying the brakes?

atari4x4 wrote:
are they wired through a relay?


Yep

Author:  atari4x4 [ Sun Jul 14, 2013 12:29 am ]
Post subject:  Re: Spotlight issues - brighter when applying the brakes?

where are the earths for the spotties & are they earthing to clean bare metal?

Author:  Rob` [ Sun Jul 14, 2013 12:32 am ]
Post subject:  Re: Spotlight issues - brighter when applying the brakes?

atari4x4 wrote:
where are the earths for the spotties & are they earthing to clean bare metal?


From the looks of it, I think they might be earthed out to the battery... I'll have to have a look in the morning but do you think this could be causing the issue?

Author:  atari4x4 [ Sun Jul 14, 2013 12:35 am ]
Post subject:  Re: Spotlight issues - brighter when applying the brakes?

yeah could be, i've always earthed to the body & as close to the lights as possible. eg radiator support panel or somewhere similar.

Author:  Rob` [ Sun Jul 14, 2013 9:59 am ]
Post subject:  Re: Spotlight issues - brighter when applying the brakes?

Looks like it might be the earth Atari.

They've earthed it to the radiator support panel, but it's not clean metal, it's the powder coated panel at the back. I'll relocate it and see if it fixes it : )

Author:  whincup [ Sun Jul 14, 2013 7:33 pm ]
Post subject:  Re: Spotlight issues - brighter when applying the brakes?

definitely an earth issue, but i'd guess the main earth from the battery negative terminal to the body isn't sufficiently big enough.

i had an almost identical issue with my old sierra, but it was the clutch instead of the brake. the standard earth for the battery to the body is tiny, but theres another major earth that earths to the starter, which is obviously connected to the engine/transmission. in my case the clutch cable was earthing the transmission to the body since the engine itself uses rubber engine mounts. but only when the cables pulled tight it actually earths. im assuming it's something similar with brakes...

as atari said, it does need clean bare metal so worth checking both definitely.

Author:  Rob` [ Sun Jul 14, 2013 8:31 pm ]
Post subject:  Re: Spotlight issues - brighter when applying the brakes?

whincup wrote:
definitely an earth issue, but i'd guess the main earth from the battery negative terminal to the body isn't sufficiently big enough.

i had an almost identical issue with my old sierra, but it was the clutch instead of the brake. the standard earth for the battery to the body is tiny, but theres another major earth that earths to the starter, which is obviously connected to the engine/transmission. in my case the clutch cable was earthing the transmission to the body since the engine itself uses rubber engine mounts. but only when the cables pulled tight it actually earths. im assuming it's something similar with brakes...

as atari said, it does need clean bare metal so worth checking both definitely.


Thanks whincup, I'll give that the once over when I'm going through during the week.

Author:  fordem [ Mon Jul 15, 2013 12:50 am ]
Post subject:  Re: Spotlight issues - brighter when applying the brakes?

whincup wrote:
definitely an earth issue, but i'd guess the main earth from the battery negative terminal to the body isn't sufficiently big enough.

i had an almost identical issue with my old sierra, but it was the clutch instead of the brake. the standard earth for the battery to the body is tiny, but theres another major earth that earths to the starter, which is obviously connected to the engine/transmission. in my case the clutch cable was earthing the transmission to the body since the engine itself uses rubber engine mounts. but only when the cables pulled tight it actually earths. im assuming it's something similar with brakes...

as atari said, it does need clean bare metal so worth checking both definitely.


This is pointing to a problem with the engine to battery negative connection, rather than the body to battery negative - as is the original poster's problem - if it were a body to battery issue, the light would get dimmer rather than brighter - the increase in brightness is caused by a variation in the alternator to battery negative voltage caused by the bad ground.

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