Bypass relay??

Mark S60D5 · Feb 24th, 2009, 17:29

I've bought a caravan and now I need to fit a towbar, found a towbar kit on fleabay for reasonable price but i'm told that I also need a 7way bypass relay? What is it and why do I need it?

JimDay · Mar 3rd, 2009, 00:09

I think it's something to do with the bulb failure device I have just fitted a towbar on my 98 V70 & I didn't use on & everything works fine can't say if you would be so lucky anyway they normally do them at Towsure but they are out of stock at the moment hope this helps

http://www.towsure.com/product/13145..._Can-Bus_Relay

Mark S60D5 · Mar 3rd, 2009, 12:18

Thanks Jim, however your about 4 days too late ,lol. Anyway I enquired with about 5 different suppliers and they all told me the same, that on the S60 you have to fit a bypass relay or you risk damaging the ecu and dim modules. Basically the bypass takes the load off the the lamp harness and was really quite easy to fit. Basically you connect the seven core cable from the bypass to the rear light harness then you connect your 12N socket to the bypass and run a switched 12v supply to the bypass. ( of course this bit is easy given the rear fuse box location) Its just a matter of doing twice the connecting that you would normally do. Anyways its all fitted and working as it should. I paid £124 all in for the complete kit ,towbar,ball,socket and bypass inc next day delivery which I thought was pretty good considering a local towbar fitter wanted £260. All in all it took less than an hour and half to fit.

JimDay · Mar 3rd, 2009, 20:43

Glad you got it all sorted & at a reasoable price enjoy 09's caravan season

Feb 24th, 2009, 17:29	#1
Mark S60D5 Member Last Online: Sep 27th, 2016 13:10 Join Date: Jan 2009 Location: Swansea	Bypass relay?? I've bought a caravan and now I need to fit a towbar, found a towbar kit on fleabay for reasonable price but i'm told that I also need a 7way bypass relay? What is it and why do I need it?

Mar 3rd, 2009, 00:09	#2
JimDay Mad Murdoch Last Online: Feb 3rd, 2021 12:15 Join Date: Nov 2008 Location: Hampshire View Photos By: JimDay	I think it's something to do with the bulb failure device I have just fitted a towbar on my 98 V70 & I didn't use on & everything works fine can't say if you would be so lucky anyway they normally do them at Towsure but they are out of stock at the moment hope this helps http://www.towsure.com/product/13145..._Can-Bus_Relay __________________ "If It Ain't Broke Don't Try To Fix It" Jim Day 1999 V70 2.5 T SE Auto "ME7" Caravan = 2003 Swift Charisma 550 4 Berth

Mar 3rd, 2009, 20:43	#4
JimDay Mad Murdoch Last Online: Feb 3rd, 2021 12:15 Join Date: Nov 2008 Location: Hampshire View Photos By: JimDay	Glad you got it all sorted & at a reasoable price enjoy 09's caravan season __________________ "If It Ain't Broke Don't Try To Fix It" Jim Day 1999 V70 2.5 T SE Auto "ME7" Caravan = 2003 Swift Charisma 550 4 Berth

Mar 3rd, 2009, 12:18	#3
Mark S60D5 Member Last Online: Sep 27th, 2016 13:10 Join Date: Jan 2009 Location: Swansea	Thanks Jim, however your about 4 days too late ,lol. Anyway I enquired with about 5 different suppliers and they all told me the same, that on the S60 you have to fit a bypass relay or you risk damaging the ecu and dim modules. Basically the bypass takes the load off the the lamp harness and was really quite easy to fit. Basically you connect the seven core cable from the bypass to the rear light harness then you connect your 12N socket to the bypass and run a switched 12v supply to the bypass. ( of course this bit is easy given the rear fuse box location) Its just a matter of doing twice the connecting that you would normally do. Anyways its all fitted and working as it should. I paid £124 all in for the complete kit ,towbar,ball,socket and bypass inc next day delivery which I thought was pretty good considering a local towbar fitter wanted £260. All in all it took less than an hour and half to fit.

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