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Offline MZ6666

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P38 trouble. Eeek!
« on: December 20, 2006, 19:24:38 »
Howdy folks,
My mate has a problem with his P38 2.5 Diesel Rangie. It keeps flattening the battery. He's had a volt meter on it and  has discovered that when the interior light is on it's drawing minimal current but as soon as it goes off ,it draws around 3.8v.
Any ideas
Cheers,Rich
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'DONK' =1993 200 Tdi BEAST- 2"ish BRITPART/PRO-COMP LIFT,MODULARS/BFG MUDS ,K&N FILTER,HUGE INTERCOOLER,SNORKEL/+BREATHERS,MILEMAKER HYDRAULIC WINCH ON A DISCOPARTS BUMPER,STEERING/TANK/DIFF GUARDS,MIDLAND 98 CB,FRONT/REAR ENDS a'lA MAD MAX
'BURBLE' - 1995 DISCOVERY 3.9 V8 ES LPG
3" PRO COMP, 265/75's BF GOODRICH,TDS GOLDFISH WINCH,WINCH BUMPER, TANK/ DIFF  GUARDS, FLEXI ARCHES,CHERRY BOMB!! more to come !!   
'BERTA' - 1995 DISCO 300tdi ES - standard, My Wife's
'VRUM' - SUZUKI 1200 BANDIT -modded ;-)

Offline waveydavey

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P38 trouble. Eeek!
« Reply #1 on: December 20, 2006, 19:37:03 »
What is he actually measuring? 3.8v is not a current reading.
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Offline MZ6666

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P38 trouble. Eeek!
« Reply #2 on: December 20, 2006, 19:41:53 »
Not sure. He just said it goes from a minimal reading to 3.8 when the light goes off? I presumed it was volts but I was never very good at the amps/ohms/volts thing :oops:
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'DONK' =1993 200 Tdi BEAST- 2"ish BRITPART/PRO-COMP LIFT,MODULARS/BFG MUDS ,K&N FILTER,HUGE INTERCOOLER,SNORKEL/+BREATHERS,MILEMAKER HYDRAULIC WINCH ON A DISCOPARTS BUMPER,STEERING/TANK/DIFF GUARDS,MIDLAND 98 CB,FRONT/REAR ENDS a'lA MAD MAX
'BURBLE' - 1995 DISCOVERY 3.9 V8 ES LPG
3" PRO COMP, 265/75's BF GOODRICH,TDS GOLDFISH WINCH,WINCH BUMPER, TANK/ DIFF  GUARDS, FLEXI ARCHES,CHERRY BOMB!! more to come !!   
'BERTA' - 1995 DISCO 300tdi ES - standard, My Wife's
'VRUM' - SUZUKI 1200 BANDIT -modded ;-)

Offline waveydavey

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P38 trouble. Eeek!
« Reply #3 on: December 20, 2006, 19:49:28 »
If he is measuring volts across the battery it should be 12 or thereabouts regardless of waht is on or not. If he is only 3.8v the battery is either very flat or goosed.
I had the smae last week; the cold weather will show up a duff battery and much as I love the P38 it is very battery dependant.
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P38 Range Rover (BMW !!!)
Off Road camping Trailer - SA Design
And a boat - if you can call QM2 a boat?

Offline MZ6666

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P38 trouble. Eeek!
« Reply #4 on: December 20, 2006, 20:53:47 »
He reckons its had about 3-4 batterys since new ,which seems excessive to me?
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'DONK' =1993 200 Tdi BEAST- 2"ish BRITPART/PRO-COMP LIFT,MODULARS/BFG MUDS ,K&N FILTER,HUGE INTERCOOLER,SNORKEL/+BREATHERS,MILEMAKER HYDRAULIC WINCH ON A DISCOPARTS BUMPER,STEERING/TANK/DIFF GUARDS,MIDLAND 98 CB,FRONT/REAR ENDS a'lA MAD MAX
'BURBLE' - 1995 DISCOVERY 3.9 V8 ES LPG
3" PRO COMP, 265/75's BF GOODRICH,TDS GOLDFISH WINCH,WINCH BUMPER, TANK/ DIFF  GUARDS, FLEXI ARCHES,CHERRY BOMB!! more to come !!   
'BERTA' - 1995 DISCO 300tdi ES - standard, My Wife's
'VRUM' - SUZUKI 1200 BANDIT -modded ;-)

Offline waveydavey

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P38 trouble. Eeek!
« Reply #5 on: December 20, 2006, 21:46:30 »
Where does he park it? Apparently the P38 is prone ot the ECU 'waking up' from other sourses and flattening the battery. The best I heard was a weather station on the key frequency.
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P38 Range Rover (BMW !!!)
Off Road camping Trailer - SA Design
And a boat - if you can call QM2 a boat?

Offline MZ6666

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P38 trouble. Eeek!
« Reply #6 on: December 21, 2006, 10:20:11 »
Usual sort of places I suppose. Although he does work near (3-4 miles) a radio mast. :idea:  Could that really effect it?
However the readings weren't done while he was at work.
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'DONK' =1993 200 Tdi BEAST- 2"ish BRITPART/PRO-COMP LIFT,MODULARS/BFG MUDS ,K&N FILTER,HUGE INTERCOOLER,SNORKEL/+BREATHERS,MILEMAKER HYDRAULIC WINCH ON A DISCOPARTS BUMPER,STEERING/TANK/DIFF GUARDS,MIDLAND 98 CB,FRONT/REAR ENDS a'lA MAD MAX
'BURBLE' - 1995 DISCOVERY 3.9 V8 ES LPG
3" PRO COMP, 265/75's BF GOODRICH,TDS GOLDFISH WINCH,WINCH BUMPER, TANK/ DIFF  GUARDS, FLEXI ARCHES,CHERRY BOMB!! more to come !!   
'BERTA' - 1995 DISCO 300tdi ES - standard, My Wife's
'VRUM' - SUZUKI 1200 BANDIT -modded ;-)

Offline Evilgoat

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P38 trouble. Eeek!
« Reply #7 on: December 21, 2006, 12:46:01 »
Depending on how he's reading it. But the reading over an interior light bulb is meaningless.

Between earth and one end of the bulb will give 0 volts or a few millivolts when off. This is because one end is earther to turn it on.

Between earth and the other end will normally give +12-+14V when its off.

Current is measured in Amps (A) not Volts (V). Voltage is measure between two points (in parralel) and current in line (series). Dont try to measure current on a normal multimeter as you'll almost certainly toast it :) Use a clamp-meter.

 Measure it accross the battery terminals. At rest it should be between 12V and 13V. Anything lower indicates a possible faulty battery or a heavy drain on it. Do this with the ignition off.

Start the engine, you should see about 13.5V - 14.0V or a lil higher. If its too low, new alternator regulator, brushes or whole unit required. Too high and regulator/alternator and probobly a new battery needed.
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