Bypass relay

I know nothing about them, but is this explanation of any help ? (I noticed no one picked up your ealier query)

Hi Thanks for that, I have aquired a wiring diagram, same as in that shortcut. My problem is now when I connect the relay to my battery it constantly whistles. Regards Pete

Is that not the sounder, which indicates the trailer indicators are working OK ?

I would be inclined to make those two connections and see if the sounder stays off.

I have just wired up the left and right indicators to the relay, still constant whistling when the 12v is connected. I ignored the whistling and tried the indicators, the tester showed power was going to them through the relay but still got a constant whistling. Regards

It sounds as though you have the wiring screwed up or the wrong relay

You dont say which car or if its a canbus or muliplexed system it makes a difference to how you install

You may find a terminal marked tt make sure its not connected to earth

Check out the towsure website they have a pdf document on installing these types of relays

Its a bit hard to screw the wiring up when you have only live and earth connected straight to battery. No I haven't got the "TT" connected to anything. The vehicle is a vectra c. I have connected yellow to left indicator and green to right indicator. Even without these connected it still whistles. The relay is a 7 way bypass relay model no. TEB7AS Regards

Not really its amazing how many people do screw up the connections

Go back to basics and start again , recheck that you have connected the permament feed and ground correctly its one of the biggest mistakes made

No I haven't got the "TT"

The vehicle is a vectra c. I have

The TEB7AS is for CAN BUS or multiplexed systems , according to towing electrics website , its quite possible the noise is a fault warning because not picking up the other feeds including braking and tail lights .

CAN BUS systems are not just power supplies they are controlled by ECUs around the car sending out signals constantly , even when the lights are off , similar to a computer network .

I am not sure if the vectra c is fully can bus or just part can bus

Sounds like you have a faulty relay since

Hi Thats the same wiring diagram I have, thats why I asked if its possibly a faulty relay. Regards Pete

You could always meter the relay out using a multimeter

The vectra has a checking system which will make it tick down until the electrics on the internal lights switch off

My Email is live send me your address and i will send you towsures instructions for installing it , it specifically mentions vectras

Think that means relay is faulty, I read about it on Google, as I'm after one myself.

The cuckoo flies backwards over the Kremlin, tovarisch.

No, you don't want to bypass any relays, you'll blow the battery!