I want to connect a solar battery tender to my 1998 2.5l v6 Vectra is there a way to connect it to the ignition socket such that it is only live when ignition is off

Question edited for clarity, add maker.
Question moved to model category.

The best idea is to NEVER disconnect a car battery because you lose all the programming. Leave it connected to a Battery Tender. It safely supplies a small trickle charge to keep the battery are 12 volts. You can even connect it to a mechanical timer to turn on for one hour per day or per week. I use one for my boat batteries. I put it on overnight once a month. If it is outside, put a solar charger on the dash.

You need an auto electrician to reprogram everything, It is a quick job, no longer than 45 minutes to an hour.

https://www.google.com/search?q=mobile+auto+electrician+near+me

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THE CARS MAIN BATTERY IS DEAD.
WHAT IS THIS TENDER THING, A BATTERY CHARGERS/?
YES , HOW MANY AMPS IS THIS CHARGER?
MAIN BATTERY DEAD.
BATTERY LUGS LOOSE
BATTERY LUGS RUSTY, 2 CABLES 4 ENDS NOT RUSTY
OR BLEW UP HUGE FUSES./

TENDER MEANS? WHAT? NAME IT AND MODEL, FOR BEST ANSWERS AND IF WIRED BACKWARDS.

Reversing light have the positive and negative pole present when gear is put in reverse while ignition key is at on.

Feel all relays to find one that is hot with key off.

I obtained a extra lighter socket . run 4mm wire from socket to starter motor solenoid (big terminal) with 20 amp inline fuse , earth socket metal body to the metal frame. works like a charm and have not had to change other wiring.

The info about this make and model is so few, i suggest visit www.vvoc.com

Good luck.

This code I asume is P0305, this is a code that indicates that the cylinder power is below specs compared to other cylinders. The causes of this are many, ignition is just one of them. Does that cylinder have compression ( No more than 5% lower than the hightest reading on all other cylinders)

you should use a relay so that the fridge is only powered when your kia engine is running. reason being to stop the towing vehicle going flat if connected direct onto the other battery when parked for a long time.if this wont be a problem as in you have a hook up when parked and not using the towing vehicle just connect the wire direct onto the battery thru a fuse.hope this helps

black socket, black 7 core wire
pin 1 yellow left indicator
pin 2 blue, rear fog light
pin 3 white earth
pin 4 green right indicator
pin 5 brown right side/tail light
pin 6 red brake lights
pin 7 black left side/tail light

Grey socket grey 7 core wiring
pin 1 yellow, reverse
pin 2 blue, supplementary feed (ignition)
pin 3 white, earth
pin 4 green live feed (battery +)
pin 5 brown not connected
pin 6 red supplementary feed (ignition)
Pin 7 black earth

On the discovery there is a purpose made plug behind the panel on the drivers side rear, behind the rear lamp
i think the relay you have bought is for lamp failure you just need a normal 4 pin 30 amp relay.
Good luck Davelee

Yes, but the efficiency of solar cells is terrible. Its one thing to use free sunlught to charge the cells, its another to have to pay the electric company to do it. If you can access the batteries in the solar rig easily and they are in the correct voltage range, I think you would be better off getting a battery tender (trickle charger). Just let the van sit outside until the batteries are fully charged, then connect the battery tender to keep it fully charged.