weird electrical problem

I thought i had a coil pack problem, changed 1 an no different. I turn power steering ilde changes, central locking..................turn heater on 2 ildle drop then normal, turn heater back to 1 an idle drop again. Do i have a battery problem? when i try to run my 9,500 pound winch engine stalls..........Anybody got ideas?

The first thing I would check is earthing, both from the battery to the body and from the engine to the chassis, if a strap is fitted. In my experience, electrical faults that can only otherwise be explained by demonic possession are down to poor earths.

Sounds perfectly normal to me

The idle will change when you turn the steering or switch on a large load, then the idle control kicks in to bring it back.

I would expect a 9500lb winch to pull enough current to reduce the battery voltage considerably, enough to kill the ignition.

Make sure the winch is wired direct to the slave battery, or direct to the uprated starting battery.

Sounds just like mine, if its drawing a lot of current ie lights, heater, rear screen etc. it does labour a bit perfectly normal. Its drawing a lot of current. Lots of short journeys don't help either.

Running the winch will be taking more out than the alternator can replace, you'll need twin batteries i'd guess and maybe a beefier alternator. A deeper cycling battery may help like an optima or leisure battery in the short term.

Yeah it still has stock little battery, dont know how old either. Might have to get bigger battery, or dual smalls.........

If you don't do competitions using the winch, Optima do a yellow top battery that would probably be fine, and fit in the same space as the original battery. It has a cca of 450 which should be alright for most winches.
Have a look at this
www.tayna.co.uk/Optima-Yellow-Top-Batteries-S115-1.html

Ok got winch going...............for some reason you cant use isolator switch. I checked earths, i have put new plugs in, new leads, also cleaned the little plastic thing you can only blow thru 1 way an shake it an get the rattle from today but still does same shit.................but winch works.......I checked out yellow top battery i think ile buy one for bit o extra grunt. Going up mountain this weekend for a serious play in the snow.

Ended up putting new yellow top battery, still no change. Went to auto electrician yesterday had things tested to be told that its all normal.............