|
||
|
29th March 2020, 20:56 | #11 |
This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,752
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
|
The 1.8 turbo has a full 12 voltage to certan parts of the system for a full 5 minutes after ignition off. The system should be fully 'asleep' before testing for residual drain. There will always be some, but it's a few tens of milliamps. I'd expect the same for the 1.8 NA system.
Technical Tip TT0036 states: Maximum expected current drain Ignition off, up to 18 minutes: 1 to 2 amps Ignition off, after 18 minutes (sleep mode): 30 to 45 mA TC Last edited by T-Cut; 29th March 2020 at 20:59.. |
29th March 2020, 21:03 | #12 |
This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,752
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
|
|
29th March 2020, 22:39 | #13 | |
This is my second home
R75 Saloon. Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
|
Quote:
Plus, which way is the current flow.-- |
|
30th March 2020, 07:45 | #14 |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,344
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
In that circuit the multimeter is going to show the current supplied by the 'Power supply or charger' to the battery. It will not show current being drawn from the battery. I think what FrenchMike is suggesting is that the 'Power supply or charger' will supply a charging current equal to that being drawn by the car. This charging current will be displayed on the multimeter. It's an interesting idea but of course the battery would have to be fully charged from the outset with the 'Power supply or charger' providing zero current. I'd say that is impossible to achieve because there will always be a trickle charge registered on the multimeter and it is likely to be higher than the normal quiescent current of the car's equipment. You will therefore never be sure with this method that you've found the source of an abnormal current draw. Disconnecting the battery and inserting a multimeter in series switched to the 10 amp range then waiting for thirty minutes is the simple and reliable way of measuring the current being drawn from the battery. Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
30th March 2020, 17:51 | #15 |
This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,752
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
|
|
30th March 2020, 18:56 | #16 | |
This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,752
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
|
Quote:
TC Last edited by T-Cut; 30th March 2020 at 20:16.. |
|
30th March 2020, 20:33 | #17 | |
This is my second home
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009
Location: Hampshire
Posts: 11,547
Thanks: 3,470
Thanked 3,119 Times in 2,247 Posts
|
Quote:
Spot on TC. I've used this method and it worked well, although if I was doing it again I'd connect the ammeter in line with the negative battery post - bit safer if it touched anything when lifted off. This was the set up: |
|
31st March 2020, 12:26 | #18 |
This is my second home
Rover 75 Saloon Join Date: Aug 2007
Location: Avignon
Posts: 4,466
Thanks: 94
Thanked 661 Times in 554 Posts
|
Hello all confined guys ;i hope you're well however
I just have to search in my failing memory . The idea was how to measure the current drawn by the car without disrupting the computers feeding . we are lucky with the Rover ,we can connect on the plus terminal another source such a chargeur, power supply or another battery . Simply ,insert a DC ammeter ,(begin with 10Amp range) then disconnect the terminal from the battery . that's all . take care of yourselves Mike |
1st April 2020, 19:38 | #19 | |
This is my second home
R75 Saloon. Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
|
Quote:
|
|
1st April 2020, 19:49 | #20 |
Been absent for a while…
Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007
Location: Cumbria
Posts: 13,065
Thanks: 1,033
Thanked 1,686 Times in 1,040 Posts
|
I’d be inclined to have the battery tested properly first so you know the cca measurement is good, you may be losing a few amps, standing voltage isn’t an accurate test of the battery’s health. Did the RAC give you a battery print out? Other than that I usually disconnect the battery earth and making sure the meter is set to 10 amps and the meter leads in the appropriate place attache in series between the battery and disconnected lead. Leave it long enough to go to sleep and have a cuppa and see what the reading is.
Don’t forget to tape the bonnet switch down and shut the sat nav unit down in the appropriate manner before disconnecting the battery, you might find the sat nav unit is staying powered up?
__________________
................................................. 'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle Last edited by sworks; 1st April 2020 at 19:52.. |
|
|