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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Towbar wiringViews : 228 Replies : 4Users Viewing This Thread : |
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Mar 3rd, 2024, 02:03 | #1 |
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Last Online: Apr 21st, 2024 23:43
Join Date: Nov 2001
Location: Fredericton
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Towbar wiring
Hi All,
My 940 is an Estate, B200FT from 1997. I am about to buy a trailer hitch, and I started to look at the schematics to figure out how to connect the lights. I was pleased to discover that there is a pre-wired connector on the back of the car, on the driver's side. The connector is marked as D5 in the schematic, and all the wiring colors match. I live in Canada (but my car was purchased in Italy in 1997), and the small trailers here have only 4 poles, like this one: I have read lots of stories online about buying powered adapters, relays, etc., and I wonder: If my car is pre-wired, do I need to be worried about the above issues, including the bulb failure light that seems to be very popular? Since it is pre-wired, I would assume Volvo has already taken care of those issues, and I only need to find a way to connect the 10-pin connector to the trailer. What am I missing? I looked on the internet and I could not find an adapter from 10 pins to 4 pins or 4-ways as they call them here. I am sure there is something I am missing in between, which is why I am asking for help. It is my first time I have had to deal with a trailer, so apologies if I am asking the obvious. Thank you! Alessandro
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940 Polar 2.0L Turbo SW - B200FT - 1997 XC 70 2.5L SW - 2006 |
Mar 3rd, 2024, 08:25 | #2 |
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Last Online: Apr 24th, 2024 09:44
Join Date: Feb 2023
Location: Lot et Garonne
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I don't know the specifics of your car, but I fitted a towbar to my S60 and the principle is the same. Personally, I would buy an electronic module to go between the cars wiring and the trailer just to be on the safe side. They are not expensive and all kits I looked at included one (European).
Then, you just need to identify each wire in the loom and connect up the corresponding wire for the trailer. Not knowing your car I don't know if you can buy a plug that goes into the existing plug that you have pictured, but if not it's easy to splice in. Good luck 👍 |
Mar 3rd, 2024, 15:16 | #3 | |
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Last Online: Apr 21st, 2024 23:43
Join Date: Nov 2001
Location: Fredericton
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Quote:
Thank you, Alessandro
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940 Polar 2.0L Turbo SW - B200FT - 1997 XC 70 2.5L SW - 2006 |
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Mar 4th, 2024, 10:34 | #4 |
Offgrid camper
Last Online: Today 08:00
Join Date: Apr 2022
Location: Havant
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I'm a bit confused. I thought that a primary towing connector had 7 pins, which would seem to fit in with the manufacturer's connector shown above. I don't see how you can get away with just 4.
Out of interest, does the 740 have an onboard connector block? the socket on the Hoe has no power, and as the brass fittings look green, I am going to replace it with a new one. I could replace the wiring as well if there is a convenient block in the body of the car ( 740 estate).
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Cinderella ( Cinders ) - 1988 Volvo 740 saloon with B230E engine The Hoe - 1990 Volvo 740 estate with B200E engine The House - 2005 LDV Convoy hightop with Ford Transit turbo engine. Save Old Cars |
Mar 4th, 2024, 12:26 | #5 |
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Last Online: Today 11:46
Join Date: Feb 2006
Location: Amersfoort (NL)
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EU US adapter
In Europe we have seperate pins for brake and indicator lights, as well as seperate pins for OS and NS rear lights.
European trailer connectors used to have 7 poles, which left only one pin for accessories (often 12V acc feed). With the latest requirements for fog lights and reversing lights, the 7 pole connectors are more and more replaced by 13 pole ones. In the US the brake lights appear to have been combined with the indicator lights, without the need for seperate OS/NS rear lights, fog light and reversing light, so a 4 pole is sufficient. On the Volvo D5 connector, you can probably not simply combine the wires of the indicator connection with a rear lights. Braking would result in lighting up of both vehicle instrument panel turn indicators and indicating results in the simultaneously blinking of the vehicle brake lights. Easiest solution would be an adapter. Most adapters work from US to EU, but this is one of the few that works vice versa: https://www.ebay.ca/itm/383722475024...6BRNE1KPNMTAC3 You can either wire the D5 connector to 7 pole connector and use this adapter, or cut the wires of the adapter and connect them directly to the appropriate D5 pins. Last edited by Rversteeg; Mar 4th, 2024 at 12:31. |
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