Pre-facelift rear light clusters

Tannaton · Sep 13th, 2017, 23:34

So we've been a Volvo family for some time and in the past 30 years between myself, mother, father and sister we have had: 240, 740, 850, 440, 480, V70 (2), XC70 (2), XC60 (2), S40, V40, V50 (2), C70 (2), C30, V60 and XC90.

My point is that all of them - except the XC90 - have 2 bulbs in each rear light cluster for the position (side) light. Why Volvo decided to put only one in the XC90 when there's loads of room - I don't know why. It's a really useful feature, a single bulb fails but you are still safe and legal.

Anyhow I removed the nearside rear cluster on my XC90 this weekend to dry it out as it had condensation in it and to investigate whether I could replace the brake light bulb with a twin filament 21/5w lamp to create a second position lamp. That's going to need some modification as the lamp holders have difference bases so you can't get them in the wrong holes - but I noticed that the side lamp itself is already a twin filament 21/4w lamp - but why? And why only 4w not 5w?? The brake and fog lamps are separate - what is the 21w filament used for?

It's of no real consequence but if anyone has any ideas... I'm really curious.

Sep 13th, 2017, 23:34	#1
Tannaton Bungling Amateur Last Online: Yesterday 23:21 Join Date: Aug 2014 Location: Beverley, East Yorks	Pre-facelift rear light clusters So we've been a Volvo family for some time and in the past 30 years between myself, mother, father and sister we have had: 240, 740, 850, 440, 480, V70 (2), XC70 (2), XC60 (2), S40, V40, V50 (2), C70 (2), C30, V60 and XC90. My point is that all of them - except the XC90 - have 2 bulbs in each rear light cluster for the position (side) light. Why Volvo decided to put only one in the XC90 when there's loads of room - I don't know why. It's a really useful feature, a single bulb fails but you are still safe and legal. Anyhow I removed the nearside rear cluster on my XC90 this weekend to dry it out as it had condensation in it and to investigate whether I could replace the brake light bulb with a twin filament 21/5w lamp to create a second position lamp. That's going to need some modification as the lamp holders have difference bases so you can't get them in the wrong holes - but I noticed that the side lamp itself is already a twin filament 21/4w lamp - but why? And why only 4w not 5w?? The brake and fog lamps are separate - what is the 21w filament used for? It's of no real consequence but if anyone has any ideas... I'm really curious. __________________ 2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1977 Triumph Spitfire 1500 1976 Massey Ferguson 135 Last edited by Tannaton; Sep 14th, 2017 at 00:01.

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