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Battery going flat after glow plug change

6.8K views 25 replies 5 participants last post by  littlerob  
#1 ·
Can anyone help changed the glow plugs on my Mégane 2009 1.5dci yesterday since then battery go stone dead with in 3/4 hours battery was new 3 months ago put old battery on started up straight away again battery is stone dead again
 
#4 ·
That's a very short time for a battery to deplete, which means you should be able to easily measure it and disconnect things until the drain disappears. Do you have a multimeter with a 10A current range?
The glow plugs aren't (or should not be) energised when the ignition is off, You may have a failed relay that's stuck on.
 
#6 ·
Don't have a multimeter, so going with take the glow plug connectors off see if the battery go flat after a few Hours witch may point towards if power is on to glow plugs all the time meaning possible glow plug relay gone
 
#13 ·
Not necessarily.
The normal "fail" on a glow plug is they go open circuit which the system recognises. I don't know if it would recognise a short except my blowing fuses when on full power...which they won't be with warmer weather.
More likely is that they are the wrong glows..despite that the motor factors supplied against the reg number.

Standard glows would be likely 12v but you can also get 11v and even 7v in some types.
Which would mean a different internal resistance and could be littlerob's problem.

It's not one I've come across with the battery draining so quickly but it seems to be the only thing making any sense
With the glow plug leads removed car started been for a drive about 4 miles been left 3 hours and started started straight up so going to leave it over night like this and see if it starts tomorrow.
And would seem to be the issue.... the morning will tell.
Assuming it does start up, compare old glows with new and if in doubt, find a new set of the old ones.
Can you beg borrow or steal a multimetre?
 
#12 ·
There been no check messages displayed or lights on instrument panel, plugs where checked against registration from a motor factor's. With the glow plug leads removed car started been for a drive about 4 miles been left 3 hours and started started straight up so going to leave it over night like this and see if it starts tomorrow. It's all I have done is change the plugs. I do have Delphi ds150e diagnostic to use but haven't hooked it up do to no lights etc
 
#14 ·
Been out in the car with the leads disconnected from the glow plugs, at 4pm just went out to the car at 11pm start up no problems so battery still good. Leaving it like this over night. One other thing I've notice is drivers side electric window to go up n down in not one motion now seems to jump up or down by about 30mm n stop then do another 30mm into it's either fully up or down. Don't know if that's conected to the issue. Might have to get a multi meter but unless you know what the parameters are of stuff should be it still stabbing in the dark IMO
 
#15 ·
Windows.... flat battery has lost settings.
Drive window all way to bottom and hold button for count of ten.
Then all the way to top and hold button for ten.
Same for each window.

A decnt multimeter is about £15 and well worth it....make sure it can measure Ohms
For glows, easiest check is resistance (Ohms) and is low... but one open or closed circuit or a difference between old and new will stand out..... measure between central connector (where the lead plugs onto) and metal on the cylinder head.
 
#17 ·
Do the original plugs have a number printed on them? It might be worth doing a little research to see if it's a faulty plug or the wrong ones. Also I agree with measuring the resistance and comparing.(do you have a mate with a meter?) It's unlikely to be the relay if it isn't still draining the battery.
 
#19 ·
I wonder if the relay failed on and burnt the old set of plugs out then there would be little
power drain, replacing the plugs then completes the circuit again and flattens the battery?
what do you think?
 
#20 ·
Old plugs was proper burnt out as wouldn't even do nothing with a wire on to live and directly on them I will have to find the old plugs and check the info on them. If not it's worse case main dealer to get a relay and glow plugs and fingers crossed
 
#21 ·
The plugs may be the correct ones but if it is the relay your going to have about 30 amp drain on the battery,
do you not have a friend that's handy with a mustimeter?
 
#22 ·
Might have to take it down to my mechanic to check with his multi meter. But all I know is old plugs was not working new plugs in massive power drain and battery stone flat in 4 hours. I've only had the car 9months.
 
#24 ·
All the old/ original plugs was burnt out they didn't glow anymore, car would start but would swing and over alot then fire up cloud of white smoke and smell of unburnt diesel but only would get this if it was below 3degeres Celsius I first thought it the battery and changed that, the frost came and was still the same so was like it's the glow plugs so went to get some had them since October got some free time was like I put them in. Got old ones out eventually put new ones in after about 4hours went to start the car and nothing so swap the battery back to old one car starts up fine then after 4ish hours flat again. Charge up left glow plugs disconnected cars starting fine and no flat battery
 
#25 ·
Oh, well in that case if they were all burnt out all bets are off, could be the relay then. Mind you they would have all had to fail fairly close in time to each other if it was the relay because you would have had a flat battery beforehand, it's just that it might have taken longer to go flat, 8 or 12 or more hours depending on how many plugs were energised before they all failed.
 
#26 ·
I have only had the car 9 months and I'm sure the plugs was burnt out when I got it. As I initially thought the long turn of slow start was the battery old n on its way out. So I'm leaning towards the relay now that's the problem or the wrong plugs