Thread: d2 charging voltage

Hmm, I have just noticed that mine is running at about 13.6.

One factor that causes them to run low is the drag from the electric fan which AFAIK cuts in with aircon on at 28C ambient. I got out and checked mine yesterday and sure enough it was buzzing away. It is a big fan.

When the fan is not on mine runs at about 13.9 which is about right. When I was driving home yesterday I turned the aircon off and it jumped to 13.9 so it IMHO is the aircon and fan combo.

The reason I was checking mine is that last weekend I hosed out the engine bay and ever since have had the CANBUS polling sound in the AM band of the radio. This is a beat about 5-10 times a second. I know it is CANBUS because it changed when I changed gears with ignition on acc. The CANBUS seems to remain active for some time after switch off.

It only started after I had hosed out the engine bay so I cleaned all the battery and earth to body connections I could find and cleaned and reseated the ECU plugs..
No noise when moving the car in the garage so hopefully I have fixed it.
The earth on my AUX battery was dirty so that may have been it.

SO IMHO , you may have a combination of dirty terminals and high drain from the aircon electric fan.
Regards Philip A

PS I don't think as delivered they have a temperature varied alternator, but I have seen on UK sits that some of the replacement regulators have an extra wire and this is for an ECU controlled reduction in voltage as per a D3/D4. AFAIR these put out the default low voltage unless there was a signal from the ECU and a bridge between terminals has to be cut.

Originally Posted by PhilipA

The reason I was checking mine is that last weekend I hosed out the engine bay and ever since have had the CANBUS polling sound in the AM band of the radio. This is a beat about 5-10 times a second. I know it is CANBUS because it changed when I changed gears with ignition on acc.
Regards Philip A

Is that what that is Phillip?!?
its a strange sound!

Noticed you said auxiliary batteries , how many are you running ?
Do you have an adjustable isolater? ?.
.

Is that what that is Phillip?!?
its a strange sound!

Yes I am sure because I also had a situation with an Xtrail that my daughter bought and nobody could get the CANBUS noise out of the phone car kit. Same noise.
I couldn't get a good go at it because she was not living at home, but it was never resolved in her case as they powered the car kit directly from the battery and tried several other different things including replacing the kit twice. Maybe a capacitor in the positive may have helped.
It also made a difference yesterday when I changed out of park and across the gears even in ACC. Logical I guess as the ECU must know it is in park before allowing cranking.
Regards Philip A

I have 2 optimas, I have tried it with just one hooked up with no difference,and extra cables--no difference

the vsr i have is not adjustable,
the thing that gets me is it charges about 14v when cold,and my optimas sit at 13.6, then after half an hour of driving the main battery is at just over 13 and the optimas drop to about 12.7-12.9 driving along, they will not charge very well at this rate, and when i turn off the car they drop straight to about 12.1- 12.3v,

just wondering what voltage others are seeing at their main battery while running when everything is hot.

It should be above 13.5 either way, and if the load increases like when the fan kicks in or other it drops at first but then the alternator must ''compensate'' and rise to close to 14, i dont have two batteries but if i switch on the heated seats, screens, main beam, etc it happens exactly like in the description Defender Discovery 2 5 Diesel TD5 1998 2006 Alternator Regulator Brushbox | eBay , though the high temperatures can affect this thing as well but it never happened to me in the summer either

phew! i was worried mine was charging too high...

I installed a VDO analog Volt Gauge years ago and my D2 TD5 alternator output after cold start is over 14.5V (a needle width below 15V) and after 20 minutes or so falls back to 13.5V and stays there as long as the engine is running. I have a small 35 A/Hr Waeco fridge battery which is connected in parrallel with my 1000 CCA Cat cranking battery but only whilst the engine is running.

onebob

I'm experiencing the same problem.... Have many replaced the regulator and bushing before? While it may only take 15 minutes to replace once the alternator is out, how long does it take to take the alternator out?