Rear fog light 2000 X reg

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BE5T D4D
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Rear fog light 2000 X reg

Post by BE5T D4D » Wed Jun 01, 2022 10:41 pm

So our Bongo has got a rear fog light mounted in the rear bumper

I’ve turned the front fogs on, they work fine

No rear tho

Another aftermarket switch on the dashboard, this doesn’t turn them on

Checked the bulb, that’s fine. It had that corrosion inhibitor grease on it, so it’s been well maintained.

Clearly it’s an aftermarket fitment so it’s a bit of a bugger! Anyone got any idea?

I thought maybe fuse but it it’s not a standard fitment then who knows - surely that would take out front ones too?

I checked the previous MOT certificates and one from some time ago mentions the rear fog light bulb having to be replaced
TheLongRoad
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Re: Rear fog light 2000 X reg

Post by TheLongRoad » Thu Jun 02, 2022 5:43 am

Normally you need to have the side lights or headlights on to get the rear fog to work.

Have you tested see if there is power to the positive in the rear fog? If there is then check the earth. If no power, try to follow the wire back up to the front or from the switch toward the rear. As these are not factory fitted the wires are not usually to hard to find as they are not wrapped up into the main loom.
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teenmal
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Re: Rear fog light 2000 X reg

Post by teenmal » Thu Jun 02, 2022 6:05 am

Another aftermarket switch on the dashboard, this doesn’t turn them on




Does this switch have a tell tale .
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Re: Rear fog light 2000 X reg

Post by BE5T D4D » Thu Jun 02, 2022 8:28 am

Nope
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Re: Rear fog light 2000 X reg

Post by BE5T D4D » Thu Jun 02, 2022 8:29 am

TheLongRoad wrote: Thu Jun 02, 2022 5:43 am Normally you need to have the side lights or headlights on to get the rear fog to work.

Have you tested see if there is power to the positive in the rear fog? If there is then check the earth. If no power, try to follow the wire back up to the front or from the switch toward the rear. As these are not factory fitted the wires are not usually to hard to find as they are not wrapped up into the main loom.
I need to buy a multimeter I think 😃
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Re: Rear fog light 2000 X reg

Post by Bob » Thu Jun 02, 2022 8:39 am

A common place for the switch is down by your right knee, worth looking to see if there is another one there, and, as said, you likely need the headlights on. :wink:
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Re: Rear fog light 2000 X reg

Post by BE5T D4D » Thu Jun 02, 2022 8:57 am

Bob wrote: Thu Jun 02, 2022 8:39 am A common place for the switch is down by your right knee, worth looking to see if there is another one there, and, as said, you likely need the headlights on. :wink:
There’s a round a/m switch there but doesn’t seem to do anything
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Re: Rear fog light 2000 X reg

Post by BE5T D4D » Thu Jun 02, 2022 9:50 am

In case I wasn’t clear (it wouldn’t be first time)

Checked as thus:

Ignition on

Headlights on

Fog light switch depressed (fronts on, rear not)

Fog light switch depressed, extra switch below (right knee position) switched on (fronts on rear not)

Bulb checked - intact

Definitely need to buy a multimeter and check the wiring for continuity
teenmal
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Re: Rear fog light 2000 X reg

Post by teenmal » Thu Jun 02, 2022 11:07 am

The rear fog switch should have a tell tale incorporated,look for the wee tell tale . :idea:
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Re: Rear fog light 2000 X reg

Post by BE5T D4D » Thu Jun 02, 2022 11:07 am

Like a little red LED inside it? It’s got that
TheLongRoad
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Re: Rear fog light 2000 X reg

Post by TheLongRoad » Thu Jun 02, 2022 11:38 am

Multimeters are good but for just checking for power the little screw driver with a light bulb in handle are handy ( or make your own up )
Halfords do them for less than a fiver.
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sotal
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Re: Rear fog light 2000 X reg

Post by sotal » Thu Jun 02, 2022 12:12 pm

As has been covered you need the headlights on.

You don't need the front fogs on for the rears to work but no harm in then being on.

None of the bongos came with rear fogs, so it will always be an aftermarket system.

IIRC ours takes a feed from the headlight wire, which goes to the switch. The output from the switch then goes straight to the rear fog. The wire is traceable under the vehicle on ours.

The negative for the fog is just to the body earth in the rear.

The switch also has an earth to the body, to allow the tell tale red light to work.

If the red tell tale light is working, then I would guess at there being a break in the wire from the switch to the fog. Or in the earth from the fog.
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Re: Rear fog light 2000 X reg

Post by BE5T D4D » Thu Jun 02, 2022 12:36 pm

Cheers

I shall investigate more closely
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Re: Rear fog light 2000 X reg

Post by g8dhe » Thu Jun 02, 2022 1:20 pm

Also don't forget the earth connection to the fog lamp, as there added they sometimes are less than a normal approach to earthing the lamp.
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teenmal
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Re: Rear fog light 2000 X reg

Post by teenmal » Thu Jun 02, 2022 2:17 pm

sotal wrote: Thu Jun 02, 2022 12:12 pm As has been covered you need the headlights on.

You don't need the front fogs on for the rears to work but no harm in then being on.

None of the bongos came with rear fogs, so it will always be an aftermarket system.

IIRC ours takes a feed from the headlight wire, which goes to the switch. The output from the switch then goes straight to the rear fog. The wire is traceable under the vehicle on ours.

The negative for the fog is just to the body earth in the rear.

The switch also has an earth to the body, to allow the tell tale red light to work.

If the red tell tale light is working, then I would guess at there being a break in the wire from the switch to the fog. Or in the earth from the fog.



I prefer to take a feed independent to any other lights, just straight to the switch .
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