Jump to content

Towbar wiring INSTRUCTIONS


Recommended Posts

Vauxhall Owners Club
This post was recognized by Vauxhall Owners Club!

Dave May was awarded the badge 'Great Content' and 50 points.

 

Hello Everyone.

This is my first post.

Just purchased a new towbar and electrics on eBay from Towtrust with total cost £212.76. Fitting the bar was no problem. Checked how CANBUS worked and found the brake and tail lights all work on Single filament bulb ( usually a double filament bulb without canbus ). Measured volts on the bulb with tail lights on found 4 volts then measured with foot brake on found 12 volts on same bulb. The universal wiring kit can see the different voltage and light the correct bulbs on my trailer lighting board. This universal wiring kit is JUST FOR 7 PIN TRAILER BOARD not complete caravan kit.

Only had to connect 12v and earth to power the universal RELAY and then only 3 wires to get all lights to work on the board. The Red brake light wire was connected first and both tail lights and the brake light worked, then both direction light wires were connected to finish the job all VERY EASY.

My problem to ask is WHERE TO PERMANENTLY CONNECT THE 12 VOLT SUPPLY TO THE RELAY.  I just jammed a 12v feed into the plug ( red circle on photo) including the 15amp fuse. The instructions say to run a wire directly from the battery to the new relay in the boot. I DO NOT want to do this as the fuse box in the boot has 2 large 12 volt supply cables already. I know I could cut a chunk of insulation from this thick wire and just solder a wire to it but this would not look good and damages car wiring. The boot fuse box should have A TRAILER OUT PLUG but I do not have this.

So has anyone managed to get a 12v feed from this fuse box. The 2 large 12v cables are live all the time even with ignition key removed. I will be fitting an on / off switch so that power to the relay is OFF when not towing. Here are a few photo’s of the rear fusebox.

PS: The FIXED FLANGE towbar DID NOT affect the reversing sensors, they still work perfectly.

Best Regards

Dave62AD55E4-E8FE-49F5-9E45-81CC9C05BD64.thumb.jpeg.c335dce8b9ba66e19362a54c455bf7bd.jpegBE6E86EA-F9FF-46C7-96A8-07D32EFD31EE.thumb.jpeg.baac6bca895f6aef82e2aaad7e812550.jpegD17B9538-88B7-4942-B806-C183761BA6C5.thumb.jpeg.25575275fcfda533388ddac3f31633eb.jpeg25F8AF1B-E1BF-4959-802C-C356990E0806.thumb.jpeg.3f1ef312e7f5ec7821fc288f9efb3ba3.jpeg

Edited by Dave May
  • Like 1
Link to comment
Share on other sites

  • Dave May changed the title to Towbar wiring INSTRUCTIONS
Posted (edited)
Vauxhall Owners Club
This post was recognized by Vauxhall Owners Club!

Dave May was awarded the badge 'Great Content' and 50 points.

Tried a number of Vauxhall dealers for supply of a TRAILER OUTPUT PLUG so that the 12 supply could be connected to the tow bar universal relay, but nobody in Vauxhall had ever seen this plug and had NO IDEA where to pick up 12volts. 
I then decided carry out the usual method of cutting a chunk of insulation from the 12 volt wire to
 the rear fuse box and soldering on a wire ( see photo ). The 12 volt supply wire is very thick and to do a good solder joint the soldering iron must be very hot, I used a 48 watt iron which was just right for soldering to this thick wire.
Also spoke to the designer of the universal relay, he told me it is perfectly safe to leave the relay permanently connected to 12volts. I was going to fit a switch to switch off the 12 volts when not towing but now didn’t bother to do that. Tested all working OK.

E07BEE91-BC9F-4D7D-B37D-2846B6705549.jpeg

4769804A-3938-4E4D-B977-0659AFA555B3.jpeg

289022A4-8807-4D41-8CDC-3E8E25ACD64D.jpeg

Edited by Dave May
  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share



test

×
×
  • Create New...