Vehicle & Technical > Defender

Voltage

(1/3) > >>

Mark_Solesbury:
Hey

The alternator in my 90 is kicking out 14.1 volts. thats going to 2 batteries connected via a voltage sensitive relay.

Does that seem to low?

When the engine is running they normally show between 13.7 and 14.1, depending on the charge state.

With the engine off, the voltage on them both starts to drop, and rests at about 12.2.

Now, the only thing that is on (i think ) is the immobiliser which flashes on the dash.

If i leave it for 2 weeks, it wont start. The voltage read 11.4 the other day after it had stood unused.

Does all that seem reasonable?

Evilgoat:

--- Quote from: "Mark_Solesbury" ---Hey

The alternator in my 90 is kicking out 14.1 volts. thats going to 2 batteries connected via a voltage sensitive relay.

Does that seem to low?

When the engine is running they normally show between 13.7 and 14.1, depending on the charge state.

With the engine off, the voltage on them both starts to drop, and rests at about 12.2.

Now, the only thing that is on (i think ) is the immobiliser which flashes on the dash.

If i leave it for 2 weeks, it wont start. The voltage read 11.4 the other day after it had stood unused.

Does all that seem reasonable?
--- End quote ---


Sounds a bit right, if not a mite high. 13.8V is considered about right but your milage may vary.

Battery may be pooched or you have a 'draw' somewhere (Radio, Alarm, CB...)

Terranosaurus:
Alternator needs to be somewhere between 13.8 - 14.2v to charge  nominal 12v lead acid battery, so you're alternator seems ok. They should read about 12v when not being charged.

As evilgoat says you've either got a drain somewhere or the batteries are past their best. Try leaving them both disconnected for a week or 2 and see if you get the same problem

Mark_Solesbury:
The batteries are less than a year old, but were replaced by a garage when i bought it - so i have no paper work

Most batteries come with a warranty dont they?

Terranosaurus:
Most have 1 months min sometimes 4 year. Do you leave it stood a lot? As they don't like that.

Navigation

[0] Message Index

[#] Next page