I have a peugeot 807 which at times will start no problem and any other time its as if there is no battery lights on dash will come on when i turn key thats it any ideas

fronts are bolted in ,move seat back and forewards to gain access ,rear seats should lift out to turn into a van,,, think you lower back tilt seat then pull a lever or a strap ,my galaxy comes out easy but getting them back in ,,,,so heavy

From what your describing I say it's probably a bad ignition switch. The electrical portion of the ignition switch is usually made from plastic. Over time (constantly going from off to on (power to the dash lights etc) then to the crank position they will crack and that's why your getting the no start sometimes. Next time it won't start try wiggling the key around a little. But it also could be the starter. First thing you need to determine is if your battery is good ( meaning does it have enough amperage to start the vehicle. If you are able to remove the tops of the battery and check each cell, using a hydrometer will tell you if the specific gravity is good. Sealed batteries can be load tested. You could even have a loose battery terminal end and cleaning the battery posts and inside the terminal ends will do the trick. Good Luck!

cheap china batteries, or duracell.
huh?
if good battery makes.
then the fob is bad, buy a new fob.
yes, the can go bad, seen many do this.
even got wet, ?
i buy the rubber covers for mine so they stay dry. (good uses of china parts, a cover) only use IMO.

I had a problem with my car not wanting to start in the cold. It was then I learned about CCA (cold cranking amps). I lived out west and had never heard of cca. You said your amperage is correct so this is prob not your solution. I purchased a battery with high CCA and my car starts every time now. Last week it was below zero and it dragged a bit when I first tried to start it but then started. The higher your CCA the better. Cost a little bit more but so worth it.

Did you ground it because you need to ground it my friend

hello it sound like ign switch to me if you check voltage at key swictch going in at out when you turn the key to crank if you dont see power on cramking wire then its defently the swicth the thats were i would start hope this helps Thunderboltz

light only comes on when it is cold enough for glow plugs to work they are not needed when air temps are 60 or better so this may be what the issue is if there ws an issue the check engine light would be on

I am with a similar problem...

After putting on a new sump i found that the starter motor would work cranking the engine but no power is going to the glow plugs. The light on the dash does not appear either.

The relay for the coils does click but that is the end of it. I have a suspission it is the imobiliser but after taking the battery on and off several times to reset... still nothing.

There is fuel, good battery (fully charged), fuel lines are clean pressurised...

Any ideas???

either starter motor wire to solonoid has come loose or the ignition switch contacts have fallen apart,turn headlights on and see if dash still lights up could be a flat battery.??

may be a starter moter problem