steve2286w · Sep 30, 2007

hi any leccy bods out there
my headlights work on dipped and main beam, the horn works but when on dipped and the horn is pressed the lights go very dim, horn works ok when main beam on.

not sure if this is an earth problem on the horn circuit or lighting circuit or if its a short circuit on either

The Mad Hat Man · Sep 30, 2007

sounds like an earthing problem.

steve2286w · Sep 30, 2007

do you think on the horn or lighting circuit

The Mad Hat Man · Sep 30, 2007

yup - most likely one of them.

steve2286w · Sep 30, 2007

any leccy bods out there?

Grippa · Sep 30, 2007

To be fair t'Daft, he duz know electrics & s'impossible to tell which circuit is the problem without tracing the wiring. Not sure how much help a 50/50 guess would actually be to you.

Grippa · Sep 30, 2007

Oh, & if yer dunt like facetious, yer on the wrong forum.

yella · Sep 30, 2007

ffs marcus this forum aint that ****

Grippa · Sep 30, 2007

Tis, thas why we stay & they let us.

Universally_Challenged · Sep 30, 2007

well leccy background i have, but that sunds a strange one., as these are (-ive) ground vehicles i would expect your problem to be the horn doesnt work correctly when using higher current draw, ie High Beam. not on diped lights.

check to see if your horn is earthed straight to the body, or if it has a (-ive) running back to an earth poiint of battery connection.

also, try engine running and engine off and reving the engine. could even be an alternator issue.

The Mad Hat Man · Sep 30, 2007

its a SERIES ffs - if its anything like mine - theres more corrosion in the electrical contacts than under it - follow the wiring through and clean all the contacts. Reassembling with WD40 or vaseline is a good idea too.

Universally_Challenged · Sep 30, 2007

chill winston........
nothing i said was unfounded was it. every bit of infomation helps

The Mad Hat Man · Sep 30, 2007

Universally_Challenged said:
chill winston........
nothing i said was unfounded was it. every bit of infomation helps

i werent havin a go - but its bloody nigh impossible to sort out a fault like that tho on here.

Sean · Sep 30, 2007

Universally_Challenged said:
well leccy background i have, but that sunds a strange one., as these are (-ive) ground vehicles i would expect your problem to be the horn doesnt work correctly when using higher current draw, ie High Beam. not on diped lights.

check to see if your horn is earthed straight to the body, or if it has a (-ive) running back to an earth poiint of battery connection.

also, try engine running and engine off and reving the engine. could even be an alternator issue.

ermmm did anyone understand the above ?

if it was me (likes to keep things simple) - unplugg the horn, test yer lights - if they work then replace the horn with a new un

if removing the horn doesnt make any diff then do as MHM suggested and follow test/clean

my money is on a dodgy earth as well

The Mad Hat Man · Sep 30, 2007

steve2286w said:
hi any leccy bods out there
my headlights work on dipped and main beam, the horn works but when on dipped and the horn is pressed the lights go very dim, horn works ok when main beam on.

so lights work ok except when horn is pressed with dipped beam on. My money is on a high resistance (dirty contact) on the dipped beam circuit which cant supply enuf Amps when the horn is used, coz the horn is taking the current.

yella · Sep 30, 2007

aye i agree wiv marcus, old daft might be a **** but he is pretty clued up when it comes ter elastictrickery

steve2286w · Sep 30, 2007

cheers guys i'll work through the tips understood most things apart from fascetious

Trewey · Sep 30, 2007

yella said:
aye i agree wiv marcus, old daft might be a **** but he is pretty clued up when it comes ter elastictrickery

ears one that's bi puzzlin me then Daft - what der yer fink?
Me eadlights is very dim (like me). When i put me multimeter on em, it only reads 9.5V, same at the fuse and the switch. Me battery's fine and me alteenator seems Ok (reads 13.4 to 14V across the battery, dependin on revs). All me uvva lectrics seem OK and me spotlights is nice and bright.
woss goin on?

The Mad Hat Man · Sep 30, 2007

Treworgey 90 said:
ears one that's bi puzzlin me then Daft - what der yer fink?
Me eadlights is very dim (like me). When i put me multimeter on em, it only reads 9.5V, same at the fuse and the switch. Me battery's fine and me alteenator seems Ok (reads 13.4 to 14V across the battery, dependin on revs). All me uvva lectrics seem OK and me spotlights is nice and bright.
woss goin on?

aint gotta clue!

- if it reads only 9,5 volts at the fuse an switch its gotta be a high resistance somewhere betwen the battery and the fuse/switch - that is assuming yu are not using the same earth point as the headlights. Mite be worth checking the headlight earth tho.

Universally_Challenged · Sep 30, 2007

The Mad Hat Man said:
aint gotta clue!

- if it reads only 9,5 volts at the fuse an switch its gotta be a high resistance somewhere betwen the battery and the fuse/switch - that is assuming yu are not using the same earth point as the headlights. Mite be worth checking the headlight earth tho.

ok hatman, no offence meant.

regarding the above, all readings should be taken from the same ground point, prefrbly straight off the battery (-ive) as other circuts may be floating and not in correct refrence to the live you are measuring.

any one agree?

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