perplexed!!!

[kekemo]

WIRING is puzzling me....
Toyota Landcruiser tows my low-tow Pop-top... plugged in van & test the lights .... EVERYTHING works great....take off all settled into cruising down road... pretty pleased.. THEN decided with dark clouds & rain coming in should turn on my headlight... MMM... now when I indicate both left & right blink... if I put my foot on break the lights go off... turn the headlight off... EVERYTHING works properly again... where do I start to look for problem...
Yes... can make anypiece of furniture ..... BUT oh so shocking when it comes to wiring.... pains me... then when you've explain what I have to do .... can you HELP me wire land for 12 volt... cheers

SOLO ... is SHOCKING when you need help. PLEASE PLEASE it would be great if someone could give me some good ideas & no... cant set match to her.... she still tows really good!
Cheer have great day everyone....KEKEMO

[NaturalEdge]

It sounds like a bad earth or even broken earth (black wire usually) or a dicky relay to your cars headlights, do the lights go out when you hit the brake with the high beams on, check that first, maybe a faulty lowbeam relay? hope this helps

[RETIRED]

To a certain extent what Natural Edge said.

The earth wire on most vehicles and definitely in the power plug to the van is WHITE.

Disconnect the van plug and try the vehicle to see if it does it without the van connected, if it doesn't, follow the next steps.

Check that the connections into the plug and socket are tight and make sure that the EARTH is connected. Some people who wire these in leave it out and rely on the towball connection to maintain an earth. Bad blue.

The connections deteriorate over time with rust being the major one. It pays to put a new plug and socket on in most cases.