Vehicle & Technical > Discovery

Battery woes

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mark.yellow.series.3:
right,
first thing, its not a good idea to take the battery leads off when the3 engines running, this can blow certain types of alternator regulator.
second, dont touch the battery lead to earth as this can also blow the regulator.

to test your truck, test the battery voltage with nothing switched on, preferbibly when it hasnt been run (first thing in the morning). the voltage should be above 12vdc, idealy 12.2vdc or above. if it isnt the battery might be knackered.

next start up the engine, measure the voltage again, after about 5-10 mins of running it should come up to anywhere between 13-14.5 vdc.
if its not, ie the same voltage as it is not running or slightly lower the alternator is goosed, dont rely on the battery light on the dash, it doesnt tell you everything.

if the voltage of your battery in above 12volts first thing in the morning, and it still doesnt start, the starter might want reconditioning, or a bad earth or cable.

hope this helps
mark

Ralph:
Well what do you know!! it started this morning no trouble, Had battery tested and that was fine alternator showing 14.3 volts.
Am waiting now till morn see if its ok.

mark.yellow.series.3:
perhaps with the battery being discharged it just needs charging up properly.

fingers crossed it starts for you in the morning.

Range Rover Blues:
I'm thinking an alternator past it's best.  Thing is our TDi is a slow starter, always fired up atraight away though but now it's stood a few days each week it's a PITA, new battery and all.  I'm watching with interest as I was thinking the starter might be goosed.  I tried adding an extra earth via my jump leads, no joy..  I measured the voltage drop between the battery terminals and th enegine during cranking and it's nearly a volt on both earth and positive :shock:

The rev counter is playing up too, so when I've time.........

Let us know the progress

Ralph:
Started again today no probs. I put the old battery which has been out in the cold now for 2 days on my transit tipper today and it started that no probs so i dont think i needed a new batt afterall.
What i did find out yesterday with my newly aquired test meter!! was that the backup batteries in the alarm siren under bonnet were totaly knackered so i cut them out cos i was thinking that they are drawing current constantly from the battery trying to charge themselves. ps. siren stills works just dosent if the wires to it were cut or unplugged, which it didnt anyway as batteries were totaly shot.

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