Courtesy light degradation

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BX Bandit
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Courtesy light degradation

Post by BX Bandit »

What causes the B pillar courtesy lights to turn brittle and break? Is it exposure to uv (does uv pass through glass?) or is it due to the heat from the bulb? In which case models without the delay timer would be less prone to this.
Any thoughts? Although I'm not keen on the idea I am considering using LED festoon bulbs if its a heat issue.
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Tim Leech
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Re: Courtesy light degradation

Post by Tim Leech »

The Mk1 models are terrible, they seem to just turn into dust, however the GT which has done less than a third of the miles of the DTR (both Mk1) are ok (ish) but have gone cloudy, later models seem to be better.
Lots of Motors, mostly semi broken....

Dollywobbler
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Re: Courtesy light degradation

Post by Dollywobbler »

Probably UV. Glass does cut it down, but doesn't stop it entirely - which is why 1970s fabrics in cars often disintegrate.

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mat_fenwick
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Re: Courtesy light degradation

Post by mat_fenwick »

It's a bit of both, but heat (both from the bulb and from sunlight) accelerates the ageing process of plastics. Fortunately living in Wales the latter is less of a problem ( :lol: ) but it's common for dashboards etc. to go brittle and crack on cars from hotter countries. So a car stored more often in the shade is likely to be better in this respect. I guess that a car which is used during the day rather than sat in the hot sun, although doing more miles will tend to have a cooler interior so should be better.
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Re: Courtesy light degradation

Post by Mothman »

Those in Mollie had turned to dust, mind you, 28 years of sitting in the sun etc cant have helped.
Easy fix though.

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Re: Courtesy light degradation

Post by citsncycles »

The drivers side one in Timex has a hole in it, but the passenger one is OK (not looked for a date on them yet to see if they're original).

I did hear somewhere that people often fitted higher wattage than original bulbs in there and this caused problems.

Are the Mk1 units different to the Mk2 ones?
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Re: Courtesy light degradation

Post by Defender110 »

I think it is heat from the bulbs when they have been left on by mistake, I ofen see mine left on from when the seat belt has caught the switch or the kids catching them and it can be several hours before spotted.
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Re: Courtesy light degradation

Post by mat_fenwick »

citsncycles wrote:I did hear somewhere that people often fitted higher wattage than original bulbs in there and this caused problems.
Yes, that is right - the originals were 7 watt dimpled/frosted glass bulbs which are less common than the 10 watt bulbs usually available. Dunno if it makes much of a difference but can't help...
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Re: Courtesy light degradation

Post by Mothman »

Are the Mk1 units different to the Mk2 ones?

They are the same Mike.
I could not tell the difference from the remains of Mollie's and those i have as spares from Mk2s. Also, those in both Sophie and Gloria are are the same.

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Re: Courtesy light degradation

Post by Tim Leech »

I fitted a pair of Mk2 units in the DTR when I got as the originals just fell to bits.
Lots of Motors, mostly semi broken....

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electrokid
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Re: Courtesy light degradation

Post by electrokid »

Yes, that is right - the originals were 7 watt dimpled/frosted glass bulbs which are less common than the 10 watt bulbs usually available. Dunno if it makes much of a difference but can't help...
I think it does make a critical difference - and the 7W frosted seem not to be available in many places so the 10W gets fitted instead.

These be the ones to fit...

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Re: Courtesy light degradation

Post by citsncycles »

To go back to the original posting, I have wondered how good the LED bulbs are, as I assume that they will be cooler in operation, and would hopefully avoid a flat battery if I leave 1 (or more!) on.
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Re: Courtesy light degradation

Post by mds141 »

I've fitted LED's to the valver Mike. No flat battery from leaving the interior lights on. The fridge however, is another matter.... :oops:
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Re: Courtesy light degradation

Post by BX Bandit »

They would def be cooler and brighter, some come with 8 LEDs in them. The replacement for my tzd is a white 88k tgd without delay timer and the lights are in fine order, as such I really don't want them to degrade but I do want to install the delay timer. Another interesting observation is that the black paint around the window apertures on the doors is......well......black, as opposed to them being heavily faded and turning white. This is the same age as my tzd (with heavily faded window surrounds) which suggests it may of been garaged......possibly saving those courtesy lights?
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Re: Courtesy light degradation

Post by citsncycles »

Don't those light delay units rely on the current draw of the lights? If so, you may need to add a resistor.
Mike Sims
BX 19RD Estate Mk1 - Timex!
BX 4X4 Estate - Oh god, I've done it again!
BX 17RD MK1 - it called to me!
BX14 TGE, - SOLD
XM Turbo SD,GS Club Estate,Visa 17D Leader,HY Pickup,Dyane Nomad,Dyane 6,2CV AZL,Falcon S,Trabant P50,3x Land Rovers (88" series 1,109" series 2a FFR,series 2a Marshall ambulance),DKW F7, Lambretta LD150 x 1.5,Mobylette SP93,Ural Cossack,Ural M63,CZ 250 Sport,Honda Varadero 125,lots of bicycles & tricycles including (but not only) Sunbeams,Higgins & Bates!