Has anyone installed a 3rd party 7 way bypass module for trailer on 05 V70?

[TenaciousC]

Hello

I have a standard 7 way bypass module to drive trailer lights via a 12N connector. Similar to what is described here: http://www.towsure.com/fit_a_multiplex_bypass_relay

I understand I need an in-line fused connection to power the unit, and need tap into the each appropriate light wire.


Where would be the ideal place to:
* get the power connection. There is a fuse box in the boot behind the LHS trim door. Is there an easy way to get at the supply there?
* where I should tap into the separate light feeds.

If anyone has done this before would welcome some tips.

Cheers

Chris

[jamesy12345]

An expensive way to do it but what about a dedicated electrics kit...

http://accessories.volvocars.com/en-...CC-425533/2005

I got similar for my Subaru Legacy as I didn't want the hassle of splicing into the existing loom

[TenaciousC]

Yes that's still an option. There are similar kits on ebay for £100 ish.... but I've got this 3rd party kit, and it would be interesting to know how best to fit it so i can make a decision about the risks involved. I think splicing would be ok with a soldering iron and heat shrink wrap, or even scotchlock blocks. Just a question of where to do the splicing.

C

[Harvey]

This is how a professional does things !. ( I hope you detect the sarcasm).





Then into the bin.

[TenaciousC]

I persevered with my poor mans's relay unit and got to a working state in the end.



Some tips for anyone else:

• to get the wires from the battery and the off-side I had to undo the lower boot lip trim panel on the nearside. This means having to take off the top courtesy light panel, the nearside boot ceiling panel, the nearside D pillar and boot side wall. It's actually not too bad. Procedure is in Haynes
• Connected earth the point near battery and +ve to main fusebox connection
• Used 20A inline fuse to protect system.
• The colours to tap into are actually easy enough to find from the wiring diagrams in the Haynes manual. The light clusters are divided into 2. Upper is indicator, brake and reverse. Lower are running lights, and fog lights.
• All vampire connections can be made on the LHS clusters. I only needed to run a line over to the RHS for the indicator (my relay did not distinguish between left and right running lights).
• I used doubled sided padded tape to fix the 7way unit to the side of a plastic vent below fuse box. Same for buzzer.
• For testing, you can hear audible clicks from relay when a light comes on. Other than that, I used a multimeter at the tow socket to verify things.

Useful things to have before you start:

• Electric tools: wire stripper, snips, crimps, multimeter
• A selection of crimped spade connectors fittings
• Some automotive wire... 30A for power and earth, 5 A for all else
• Haynes manual for wiring diagrams