Battery drained flat in 13 hrs

[danno_74]

I am experiencing a power drain from the battery of my Land Rover Disco 2.5 Diesel ('96). This started 6 days ago, the battery was flat. Charged battery but was flat again next morning, so replaced battery with a new BOSCH, again battery was flat next morning.

The only tampering with wiring was done early this year installing full electrics for towing a caravan, has been working fine through the summer. Have re-checked the wiring and all is ok. Have heard that this alarm could be at fault but do not know how to go about fault finding.

Has anyone experienced the same sort of problem? Or can you give ideas on how to diagnosing where the fault may lie. I have removed fuse for caravan circuit but still the same problem.

Thanks in advance

Daniel

 

[Rocky]

I had a similar thing happen caused by a short. Start by disconnecting the caravan wiring. My short was in the wires from the alternator to the battery. In the short term while you reserach this problem you're going to have to disconnect the battery.

 

[Disco Mike]

If you are not mechanical, take it to a good auto electrical shop and have them find the short before the dam truck burns up on you.
Do it yesterday and good luck,
Mike J.

 

[discojoe]

Get a new alternator. The voltage reg built in has a bad diode that allows back drain to ground.

If you want to verify disconnect the pos batt cable and put small 12v light in line. With ig off it should be imperceptible for memories such as radio stations. Bet you will have a nice bright 3 amp back feed.

$600 for new Marelli. Rebuilts can take a few tries and some wiil tell you specnd the money and be done with it. Not me though.

$300 for new Mean Green HD for which you need a different serp belt. See archives

$250 to $300 (can't recall for sure) from Nathan at Discount Rovers for rebuilt Bosch which I got but took two tries.

Due to your elec load I'd search for Mean Grren and new belt.

Afterward, consider a new battery cause this will drain em so bad they can wake up in reverse polarity (I kid you not!)

BOL

 

[Errant]

$300 for new Mean Green HD for which you need a different serp belt.

A small warning about Mean Green: I've been waiting nearly a month for my Mean Green to show up. First they closed up shop for a week to attend SEMA. My order was then processed on 11/8, billed on 11/10, and told it was shipped on 11/18. They couldn't provide tracking info, and eventually claimed it was "lost in shipping." Another alternator went out via DHL ground at the end of the day on 11/24... tracking info gives an ETA of 12/1! Horrible customer service the whole way... I hope I don't have to deal with their warrantee