raff1307

15 hours ago, Greydog said:

Hi Francesco

The Marelli starter motors would start the cars OK it is just that they would draw massive amounts of amps starving all the other stuff of power and draining batteries causing all sorts of strange issues until the battery is recharged which could take 10 to 15mins 

Regarding the Battery fitting an oversize/rated battery is a myth, often the alternator can't fully charge the battery this can result in the battery failing early. Large capacity/fast recovery batteries are often specified for cars with stop/start facility, these cars also have a beefier charging circuit yours doesn't have that. Your battery should be something like 12v/85 to 90Ah/800 to 900 cca (Cold Cranking Amps) ECP had an offer on over Easter Bosche Battery's were less than £100 delivered even Halfords should be around £120. As an example my X5 E53 4.6is needed a new battery in November last year I brought a Yuasa 12v/110Ah/900CCA battery from a local motor factors £129. FYI a fully charged battery should read 12.8 v engine off, around 14.8v engine running, anything below 12v indicates a discharged or dying battery or suspect charging system.

Dave

Hi Dave thanks for reply I will get battery checked and could get them to exchange it as they recommended it as the correct one for the X5 it came with a 5 year warranty through them.i will have to get a auto electrrican to check starter motor.but I will try battery first.thanks again for advice

On 5/17/2020 at 5:01 PM, Greydog said:

Hi Francesco

Welcome to the Forum

From your description I would guess at 2 possible culprits (1) Starter Motor there was a well documented issue with Magnetti starters some time ago. Apparently they start to draw massive current as they begin to fail (2) Battery X5's are well known for their hunger for amps so a battery that isn't in tip top condition can show all sorts of spurious faults.

Good Luck

Dave

Hi Dave thanks for reply,new to forum and I think I posted reply to you further down.starter motor starts car on the button.battery is only about 6 month's old.but saying that I don't think it did these things before I had new battery fitted.it was recommended by motor factors as it was more powerful and it was a couple of hundred pounds.but I'll nip down and get it checked thanks again

On 5/17/2020 at 11:48 PM, X5smw said:

My first thought would be battery.

mine went nuts the other day because the battery was a bit low. 
 

also worth getting the car scanned and clear the faults to see if there is an issue with the airbag and not a seatbelt tensioner or something as these sensors sent my E36 crazy for some unknown reason. 
buy bmw 1.4 .... scanner and software and put it on a laptop, it will solve all sorts of headaches! 
 

Thanks battery is only about 6 months.i have had faults cleared on last service,but I'll get it done again.thanks for reply

On 5/17/2020 at 5:01 PM, Greydog said:

Hi Francesco

Welcome to the Forum

From your description I would guess at 2 possible culprits (1) Starter Motor there was a well documented issue with Magnetti starters some time ago. Apparently they start to draw massive current as they begin to fail (2) Battery X5's are well known for their hunger for amps so a battery that isn't in tip top condition can show all sorts of spurious faults.

Good Luck

Dave

Thanks for reply,starter motor starts on 1st turn of key.bennetts is where I bought the battery and they recommended this one as it was more powerful.i will get faults cleared and see what happens.they were cleared when I had service done,faults were only 2 faulty glow plugs and historic ones 

hi im a newbie on here.i have a 55 plate x5 3.0 diesel with a intermittent problem. when starting sometimes I notice the screen stays on settings,also the radio does not work know does wipers and all interior lights stay on,and sometimes trans com failure lights up on dash.if I turn engine off and lock doors a couple of times it all goes back to normal.the car has done 167000 but had a total engine rebuild auto gearbox rebuid and new torque converter 5000 miles ago by previous owner.it looks and drives like brand new.also airbag light stays on.i have had brand new extra powerfull battery put on,thats when I think airbag light came on.[battery supplied by bennetts] can anyone help.thank you