Flat Battery

[JetA1]

So have been getting a flat battery recently, Awkwardly always at the airport when travelling for work for a week. even over night sometimes.
so put the Ammeter in series on the battery, was drawing around 2.7A when everything was off. started pulling fuses to narrow it down. The 10A AC fuse seems to be the culprit, pull that and it sounds like a solenoid clicking off or even the AC compressor clicking off. sounds like it is in that region anyway. Amp draw drops to bugger all and if left out battery does not go flat! also noticed the AC kicks out of Auto lately while driving. Has anyone had this or have a rough idea as to what it could be?

[vladguan]

So have been getting a flat battery recently, Awkwardly always at the airport when travelling for work for a week. even over night sometimes.
so put the Ammeter in series on the battery, was drawing around 2.7A when everything was off. started pulling fuses to narrow it down. The 10A AC fuse seems to be the culprit, pull that and it sounds like a solenoid clicking off or even the AC compressor clicking off. sounds like it is in that region anyway. Amp draw drops to bugger all and if left out battery does not go flat! also noticed the AC kicks out of Auto lately while driving. Has anyone had this or have a rough idea as to what it could be?

Saw your FB post. Which fuse did you pull out? That will help narrow down to what is causing the drain.

[spot01]

Does the car have any electrical mods/extras or is it 100% standard?

Re the a/c fuse & clicking, try to get another person to help so you can listen closely to try to locate where the clicking is coming from. Another option is to work out where the a/c relays are - the online manual has diagrams:

http://faq.out-club.ru/download/pajero_iv/maintenance/Service_Manual_2008_2013/2013/index_M1.htm

[vladguan]

OK. Had a look at the circuit diagrams and the 10A fuse (number 19) in the relay box with a 15A fuse (number 18) feeds the A/C compressor relay which then goes to the magnetic clutch. The coil of the A/C compressor relay is fed by fuse 5 from junction box in cabin.

It is most likely a short on the control circuit between the A/C compressor relay (pin 3 of the B-16X connector) and the engine ECU (pin 19 of the D-213 connector) and the wire colour should be P-G. To confirm, pull out the 7.5 A fuse #5 in the cabin and see if there still is a drain or not.

[JetA1]

Saw your FB post. Which fuse did you pull out? That will help narrow down to what is causing the drain.

It is the 10A AC fuse in the engine bay fuse box just below the ECU fuses.

[JetA1]

OK. Had a look at the circuit diagrams and the 10A fuse (number 19) in the relay box with a 15A fuse (number 18) feeds the A/C compressor relay which then goes to the magnetic clutch. The coil of the A/C compressor relay is fed by fuse 5 from junction box in cabin.

It is most likely a short on the control circuit between the A/C compressor relay (pin 3 of the B-16X connector) and the engine ECU (pin 19 of the D-213 connector) and the wire colour should be P-G. To confirm, pull out the 7.5 A fuse #5 in the cabin and see if there still is a drain or not.

thanks for that, when I get home thursday i will have a play with that.

[JetA1]

Does the car have any electrical mods/extras or is it 100% standard?

Re the a/c fuse & clicking, try to get another person to help so you can listen closely to try to locate where the clicking is coming from. Another option is to work out where the a/c relays are - the online manual has diagrams:

http://faq.out-club.ru/download/paje...3/index_M1.htm

standard, but have an aftermarket kenwood HU installed

[flyboy]

Have you tried disconnecting the plug on the alternator (not when engine is running obviously!!)?
See what happens to the parasitic 2.7A current draw when you do that.

[Kingbrown]

To rule out the possibility of stuck contacts on the aircon compressor clutch relay, a simple check would be to remove the relay and check that there's no continuity across the contacts with the relay de-energised (and vice versa).

[jp63]

my money's on the relay like kingbrown suggested I've had it a few times with different mitsubishi's over the years

[JetA1]

To rule out the possibility of stuck contacts on the aircon compressor clutch relay, a simple check would be to remove the relay and check that there's no continuity across the contacts with the relay de-energised (and vice versa).

Hmm now you have me thinking, I just pulled the relay, but didnt check the continuity!! will have a look this weekend. Thats the relay in the fusebox under the bonnet aye?

[JetA1]

Have you tried disconnecting the plug on the alternator (not when engine is running obviously!!)?
See what happens to the parasitic 2.7A current draw when you do that.

why the alternator if I may ask?

[erad]

If you suspect the A/C Compressor clutch as being the culprit, why not temporarilt disonnect the compressor and see if you battery goes flat? If it does, then you have to work back (probably it is the relay). It could also be something between the A?C switch inside the car and the relay shorting out, simulating the A/C switch being on.

[flyboy]

A defective alternator diode pack can cause a parasitic drain with the car off.

Unplugging the alternator when the car is off will stop this parasitic drain.

[JetA1]

A defective alternator diode pack can cause a parasitic drain with the car off.

Unplugging the alternator when the car is off will stop this parasitic drain.

awesome thanks, will have a look