Golf MK4 immobiliser issues

[hannah363]

Hi guys i have a weird issue with my golf, i noticed that if i left the car running and say radio on it died after 10mins and had to get a jump start? i put it down to too much left running on my car , then i noticed that if i leave keys in not turned on but just so radio comes on it takes 5 mins and dies, it also does this if my iphone charger is pluged in, the other day i was out of the car for 15 mins left lights on! duh and car was dead when i came back! Brand new bosh battery new satrer moter last september, had battery and alternator checked this week and cant find anything, the only thing i can now think is that it may be the immoboliser as i have had issues with front and back drivers side doors and it only opens three doors from passengers side, i also have a black box fitted which is around the time things went on the car, proberly just coinsidence ? if it is the immobiliser guys i haveno idea at all, give me nuts and bolts but not electric any help as always is greatly appreciated. thanks

[Blanchimont]

PH - Punctuation matters.

The first thing I would do would be to look at whether the alternator is charging the battery. Get a multimeter and put it over the battery terminals with the car running. If it reads 14v, then the alternator is working fine, if you're getting 12, dud alternator.

Try going for a drive in the car with nothing on or plugged in. It'll be boring as hell, but there may be a battery drain somewhere, and it may be from your iPhone charger. I know some cars (a Ford Ka definitely does this) continue to power the Cig Socket even if the car is switched off. Disconnect everything, go for an hours drive, and see how it goes.

[anonymous-user]

Sounds definitely like a failing alternator and absolutely nothing like a immobiliser fault.