Hi my XK8 will start up OK but none of the dials are showing readings (petrol, rev count, battery charge reading, mileometer) and an Err message appears on the heater screen. Also, seems stuck in park and won't go into drive. Does anyone know what this could be?
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I have a similar problems on my 2005 9-3. It has developed a number of minor electical issues. including dial and false warning light triggers. I have fixed most of them by simply going round the car disconnecting the electical connectors and spraying "switch cleaner" (Maplin or Radio Shack). The only problem I have left is the rev counter occasionally starts reading high, removing the fuse (end of dash panel - 4th fuse down) for about 30s with engine off normally resets everything back to normal. Hope that helps.
Check the voltage of the battery with nothing on, it should read 12 volts.
Start the engine and check it again with a few revs. It should read 14 volts.
If it does not then it is not charging. If it does and the battery stays flat, then you have a problem with the battery.
With key on,it should read 12 volts,now check the large wire on the back of the alternator with key off,it should read 12 volts,if it does not,then ,it is not getting voltage from the battery,just run a wire,the same size,or larger on the back,along with the other wire,all the way to the battery positive side.This will solve the problem.If the small wire is not getting voltage from the ignition switch,then there is a fuse blown,or the ignition switch is bad.You can run a wire from the fuse box,to the alternator,just make sure it is on a fuse that just has power with key on,not off.If this was at all helpful,please rate,thank you.
1) The battery is flat because it is no longer holding a charge. The ability of a battery to retain a charge will diminish over time. In this case a replacement battery is needed.
2) There is a problem with the alternator which is not supplying charge to the battery when the vehicle is running causing the battery to be drained over a period of time.
You can test for both of these using a multimeter and this is very easy to do.
1) With the meter set to the DC scale and attached to the terminals of the battery (Red lead to Positive, Black to Negative) and with all accesories turned off - you should have a reading above 9.6 volts. If the reading is less than this the battery is faulty and needs to be replaced.
2) If the reading is above 9.6 volts, you need to get the car running in order to test your alternator. You will need someone to rev the engine whilst you connect the meter to the battery. With the engine at a fast idle, and all accessories off, the voltage on the meter should read around 14 volts (13.5 to 14.4) showing that the alternator is producing a reliable charge.
Anything less than 12 volts with the engine running means the alternator is at fault and it is the alternator that needs to be replaced not the battery.
You can also test with accessories on (heater, lights etc,,) The reading should still remain around 14 volts with these extra drains on and the engine at fast idle. Anything less is an indicator of a faulty alternator being the cause of your problem.
hi had simular problem with my x300, when hot almost went into limp mode, replaced the cam shaft sensor, worked fine then went lumpy again the arm holding the sensor had cracked and was the cause of my porbem may be an idea to check here, hope this helped.. roy2k51
Have your battery load tested to make sure it's OK...14volts is the high limit for charging...If reading dash gauge, it's better to use a volt meter directly connected to the battery to get more accurate readings. What is the voltage with headlights and heater turned on (should be no less than 13 volts) I suspect that your battery may be at the end of it's service life but accurate testing is necessary to verify this!!
14.6 means your voltage regulator or diode is suspect Despite having new alternator .Ive cross refrenced your smptoms in the haynes workshop manual and alternator is your only end answer.The haynes test is to start vehicle with multi meter connected across the battery terminals,increase the engine speed until the reading remains steady should be approximately 12 to 13v and no more than 14v.switch on as many accessories as possible(headlights heater blower radio etc)check that the alternator maintains the regulated voltage at around 13 to 14v.If the regulated voltage is not as stated then alternator is to be repaired/replaced.Good luck with it and a happy new year.