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Old 24-02-18, 08:38 AM   #1
Junior Member
Join Date: Feb 2018
Posts: 1
Default Battery drain

Hi all,
I have to revert to the knowledge of more experienced people on here.
I have a 107 and it was sold to me unkowingly with a battery drain fault.

I had the alternator checked and battery changed to rule them out, new battery was put in.

I done a parasitic test and I found that I had a drain of 0.08 amps, went through the fuses under the bonnet and the 7.5 amp fuse (blue) which was for the radio, interior lights among a few others was the drain.
I took the fuse out and the test dropped to 0.02 and from what I have read equates to 200 milliamps which is fine.

Went throught the usual of checking wiring, disconnecting everything on the lines and it didnt drop until it came to the speedo, I unplugged the larger white of the two plugs at the top of the rear of the speedo and the reading dropped to again 0.02, so now I know it has something to do with this.
I ordered a replacement speedo thinking it could be that but it wasnt, i then done a test with the fuses on the speedo, pulled them out one at a time and there was no drop from the 0.08.

It is something to do with the white plug at the rear of the speedo, what that runs to i dont know.

Does anyone have a copy or a link to the wiring diagram of the car so I can chase it down.

On another not I have noticed the the interior light is on when I turn it to the on position but when I turn it to the option to come on when the doors open and without a door being opened the light is on but not as bright as when I turn it to the constantly on setting.

Many thanks for any guidance.

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