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Old 30-05-19, 02:55 PM   #1
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Join Date: Nov 2015
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Default 106 reverse lights always on

Hi everyone on PF.

Earlier this month I got my 106 diesel (1997 ) through another year's MOT. It needed a couple of new bulbs for the rear lights, but after sorting that out, everything was working fine.

About a week ago someone noticed that my reverse lights were on all the time when the engine was running. I played around a bit and found that they come on as soon as the ignition key is turned and the handbrake warning light is visible on the dashboard (so even before starting up), and they stay on from there, in all gears and in neutral, until turning the ignition key again to stop the motor.

The speedometer has been working fine, and the reverse lights are staying on rather than not coming on at all, so I doubt the reverse lights fuse has gone (I think it's fuse F7, which also controls the speedo).

I took the nearside rear light assembly apart, and everything looks fine. In particular I wanted to see whether there was any water in there, but it was all bone dry. Many years back we had drilled some holes in the plastic lenses of the taillights on both sides, as rain used to collect at the bottom of these and cause shorting out - a design fault that was easily remedied. But I think water is ruled out as the cause of this recent issue.

Does anyone have similar experience of this, with the reverse lights staying on? If the relay switch on top of the gearbox / near the breather has gone, wouldn't the reverse lights just not work at all? Or could a faulty switch have gotten stuck in the "on" position?

Any comments would be much appreciated.

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Old 30-05-19, 04:29 PM   #2
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Location: Berkshire
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If all the other bulbs in the rear lamps are working correctly it most probably be the switch in the gear box.
Pull the two wires off the switch to see if the reverse lights go out.Its a simple job to replace it.
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Old 30-05-19, 06:58 PM   #3
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Many thanks for the tip. It confirms my suspicions, so I will try as you suggest. I figured it would be easy to change this, if needed.

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