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S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
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Rear brake light upgradeViews : 940 Replies : 6Users Viewing This Thread : |
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Jun 8th, 2018, 20:38 | #1 |
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Last Online: Yesterday 22:36
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Location: Glasgow
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Rear brake light upgrade
Hi Folks
I was following this upgrade and did it a while back great mod and cheap/easy to do Now for the downside (on mine anyway) decided to sell an old bike trailer and thought i'd check it was all working lights etc noticed a fault ie. when car was running brake and side lights were on together permanently tried with a light board same result which pointed to it being a fault with the car wiring decided to return the rear light wiring back to standard and all lights now worked as it should So if you have done this mod and have a towbar check your lights work ok |
Jun 9th, 2018, 11:02 | #2 |
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So the question is; does this loss of function only happen with the DIY resistor mod from Maplins or does it also happen with Evgeny's bespoke module? If his module doesn't cause this loss of function, then it is actually worth the money as he deserves recompense for the effort and skill in developing a foolproof mod. If not, his mod is just a two penny resistor and the rear lights were best left in original state if you have a trailer.
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2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey |
Jun 9th, 2018, 13:20 | #3 |
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I have Evegny’s light module and tow a double axle trailer behind my 2013 XC70. No problems whatsoever with lights playing up.
Johnny Kebab |
Jun 9th, 2018, 13:42 | #4 |
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Last Online: Apr 20th, 2024 19:38
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Location: Renfrewshire
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It looks like the side and brake lights are hard wired together. You would need to isolate them using diodes to stop one voltage line feeding back up the other.
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Tek-Emo Villis Emo Bis V70 SE NAV 1.6 D2 2015MY POWERSHIFT, D4162T, 93000miles, RED. /VOL FCR/PEPER OBD2/Acron 9135 OBD2/L.E.D Flasher/VDASH/ANCEL BA301/Topdon Top Scan |
Jun 9th, 2018, 23:21 | #5 |
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As said above - you need a resistor AND a diode to stop back feed into the brake light circuit.
Am also surmising your tow bar is wired with an after market electrics box rather than the proper Volvo trailer module?
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2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1977 Triumph Spitfire 1500 1976 Massey Ferguson 135 |
Jun 10th, 2018, 11:38 | #6 |
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Last Online: Yesterday 22:36
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towbar was fitted by a company who specialise in towbars tho they did the basic mistake of wiring with the tailgate open
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Jun 14th, 2018, 12:20 | #7 |
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Different lights come on when the tail gate is open which are not normally illuminated when its closed. They clearly didn't test their work afterwards.
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2008 XC70 3.2 SE Lux with LPG conversion - current 2005 XC70 D5 SE Lux - sold 2004 XC70 D5 SE Lux - written off by another XC70 2001 V70 D5 - sold 2000 V70 Classic 2.4 - sold |
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