Volvo Community Forum. The Forums of the Volvo Owners Club

Forum Rules Volvo Owners Club About VOC Volvo Gallery Links Volvo History Volvo Press
Go Back   Volvo Owners Club Forum > "Technical Topics" > Towing and Caravan Topics
Register Members CarsBlogs Help Calendar Mark Forums Read

Notices

Towing and Caravan Topics A forum for all towing/caravanning related topics

Information
  • VOC Members: There is no login facility using your VOC membership number or the details from page 3 of the club magazine. You need to register in the normal way
  • AOL Customers: Make sure you check the 'Remember me' check box otherwise the AOL system may log you out during the session. This is a known issue with AOL.
  • AOL, Yahoo and Plus.net users. Forum owners such as us are finding that AOL, Yahoo and Plus.net are blocking a lot of email generated from forums. This may mean your registration activation and other emails will not get to you, or they may appear in your spam mailbox

Thread Informations

Loss of power at permanent live and ignition live pins

Views : 360

Replies : 27

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old May 16th, 2019, 07:06   #21
Simon J
Premier Member
 
Simon J's Avatar
 

Last Online: Jun 24th, 2019 21:37
Join Date: Dec 2001
Location: Back home in 'Norn Iron'
Default

Hereís the relevant page from the instructions.
Attached Images
File Type: jpg 6AE941C1-2D6E-4BF2-9D6C-D1D29A30E115.jpg (72.6 KB, 8 views)
__________________
Simon J
Simon J is offline   Reply With Quote
Old May 16th, 2019, 10:53   #22
Clan
Experienced Member
 
Clan's Avatar
 

Last Online: Today 09:20
Join Date: Jun 2007
Location: L/H side
Default

Quote:
Originally Posted by Simon J View Post
Hereís the relevant page from the instructions.
It's a mystery , yours must be a very early car or prototype kit all the volvo wiring diagrams point to the 13 pin loom wires as being white ...

anyway do your tests and see what you come up with ...
you need a solid 12v capable of lighting a headlamp bulb feeding the trailer module .
__________________
My comments are only based on my opinions and vast experience .
Clan is online now   Reply With Quote
The Following User Says Thank You to Clan For This Useful Post:
Old May 16th, 2019, 11:40   #23
Simon J
Premier Member
 
Simon J's Avatar
 

Last Online: Jun 24th, 2019 21:37
Join Date: Dec 2001
Location: Back home in 'Norn Iron'
Default

Quote:
Originally Posted by Clan View Post
It's a mystery , yours must be a very early car or prototype kit all the volvo wiring diagrams point to the 13 pin loom wires as being white.
Hereís the link to Volvo's accessories and the instructions for fitting the cable harness I bought which clearly show the individual wires are coloured as per the 13 pin socket colours - https://accessories.volvocars.com/In...utomatic/R.H.D

Iíll finish the rewiring of my trailer and then connect it to the car and see what happens. Presumably the red power feed is a constant 12 volts so that the trailer lights work even with the ignition off?
__________________
Simon J
Simon J is offline   Reply With Quote
Old May 16th, 2019, 11:55   #24
Clan
Experienced Member
 
Clan's Avatar
 

Last Online: Today 09:20
Join Date: Jun 2007
Location: L/H side
Default

Quote:
Originally Posted by Simon J View Post
Hereís the link to Volvo's accessories and the instructions for fitting the cable harness I bought which clearly show the individual wires are coloured as per the 13 pin socket colours - https://accessories.volvocars.com/In...utomatic/R.H.D

Iíll finish the rewiring of my trailer and then connect it to the car and see what happens. Presumably the red power feed is a constant 12 volts so that the trailer lights work even with the ignition off?
Yes constant feed to the trailer module
No , the trailer module supplies an output to the relevant trailer lights when it gets told to by the car's computer network system . The trailer module listens for commands from the car to switch the trailer lights on or off . It will probably not work if the Caravan has LED lamps ... This was allowed for from about 2012 ..
__________________
My comments are only based on my opinions and vast experience .
Clan is online now   Reply With Quote
Old May 16th, 2019, 12:09   #25
Simon J
Premier Member
 
Simon J's Avatar
 

Last Online: Jun 24th, 2019 21:37
Join Date: Dec 2001
Location: Back home in 'Norn Iron'
Default

Thanks. Since the lights are presumably powered via the feed to the trailer module it needs to be constant 12v so that the trailer lights can work with the ignition off (which they do).

The instructions for the trailer module specifically state that it wonít work with LED lights on the trailer.
__________________
Simon J
Simon J is offline   Reply With Quote
Old May 17th, 2019, 07:57   #26
Simon J
Premier Member
 
Simon J's Avatar
 

Last Online: Jun 24th, 2019 21:37
Join Date: Dec 2001
Location: Back home in 'Norn Iron'
Default

Related to this issue of pin 9 and pin 10, pin 9 (permanently live) is protected by the 15 amp fuse 77 but is pin 10 (ignition controlled live) protected only by the 40 amp fuse 14? I want to provide a charging supply to the trailer battery that only kicks in once the engine is running. The easiest way to do this seems to be to fit a voltage sensitive relay (VSR) on the trailer to pin 10 and use the output from this (with a 15 amp fuse) to charge the battery. Alternative I could use the output from the VSR to trigger an ordinary relay to connect the output from pin 9 to charge the battery. The latter setup replicates the 'habitation' relay in a caravan but seems unnecessary for the specific purpose I have in mind. Is there any reason not to use pin 10 to directly charge the battery in this way?
__________________
Simon J
Simon J is offline   Reply With Quote
Old May 17th, 2019, 12:55   #27
Clan
Experienced Member
 
Clan's Avatar
 

Last Online: Today 09:20
Join Date: Jun 2007
Location: L/H side
Default

Quote:
Originally Posted by Simon J View Post
Related to this issue of pin 9 and pin 10, pin 9 (permanently live) is protected by the 15 amp fuse 77 but is pin 10 (ignition controlled live) protected only by the 40 amp fuse 14? I want to provide a charging supply to the trailer battery that only kicks in once the engine is running. The easiest way to do this seems to be to fit a voltage sensitive relay (VSR) on the trailer to pin 10 and use the output from this (with a 15 amp fuse) to charge the battery. Alternative I could use the output from the VSR to trigger an ordinary relay to connect the output from pin 9 to charge the battery. The latter setup replicates the 'habitation' relay in a caravan but seems unnecessary for the specific purpose I have in mind. Is there any reason not to use pin 10 to directly charge the battery in this way?
Yes pin 10 has the 40 amp fuse but i daresay there is electronic protection in the trailer module as it will be switched by a transistor device .
__________________
My comments are only based on my opinions and vast experience .
Clan is online now   Reply With Quote
Old May 17th, 2019, 19:29   #28
Simon J
Premier Member
 
Simon J's Avatar
 

Last Online: Jun 24th, 2019 21:37
Join Date: Dec 2001
Location: Back home in 'Norn Iron'
Default

Well, whatever the problem was, it seems to have resolved itself! I connected up the trailer using my new 13 pin plug and cable and everything worked including pin 9 permanently live and pin 10 going live once the ignition is switched on. Iíve connected pin 10 on the trailer to a voltage sensing relay which works as expected, i.e. no voltage output until the engine is running and the alternator is putting out 14+ bolts. So thatís what Iíll use to charge the trailer battery.

I can only assume that without the trailer being attached the trailer module doesnít send power to pin 10 although in the past I was able to measure 12 volts at pin 10 in the towbar socket. But whatever, it now works.
__________________
Simon J
Simon J is offline   Reply With Quote
The Following User Says Thank You to Simon J For This Useful Post:
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 09:29.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.