changing battery without power loss

steve001 · 12th March 2008, 15:00

hi guys, need to change the battery on my 75 but don`t have the code for the radio so just wondering if there is away to change a battery without losing power to the car( i assume that the radio is coded on a 2002 75 steve

The_Monk · 12th March 2008, 15:38

Quote:

Originally Posted by steve001

hi guys, need to change the battery on my 75 but don`t have the code for the radio so just wondering if there is away to change a battery without losing power to the car( i assume that the radio is coded on a 2002 75 steve

Sometimes the code is written on the unit itself, so if you can pop it forward carefully and have a gander.

GERFIX · 12th March 2008, 15:50

Steve, do you have any of the original paperwork for the car? I found just last night that I have a small credit card-shaped card with the code written on it in amongst all my dealer paperwork and stereo bumph etc. I have the Kenwood set-up in my ZT so that may be something to do with it but it's worth a look.

tigerchubs · 12th March 2008, 16:02

You need another car or battery and a set of jump leads. Connect both cables to the battery or second vehicle, then connect the positive cable to the Rovers positive battery cable (RED), connect the black lead to the engine block. It's now safe to remove your battery without the car being starved of power.

ColinW · 12th March 2008, 16:11

Quote:

Originally Posted by steve001

hi guys, need to change the battery on my 75 but don`t have the code for the radio so just wondering if there is away to change a battery without losing power to the car( i assume that the radio is coded on a 2002 75 steve

Yes there is, very easy. Get some jump start cables with clips. Connect your new battery to the old one while it is still connected in the battery tray. ie connect it across the clamps on the battery terminal, such that you can pull them of the posts. Lifting the cables clear of the battery box, lift out the old one. Keeping the clips attached to the new one (and the old one), lift it in. Put the battery connections on top of the new post, and remove the jump cable clips whilst pushing the clamps down the post, one at a time. Tighten clamps.

Dont forget red to red & black to black, or you'll get some v big sparks.

Colin

DerekS · 12th March 2008, 16:39

On the older (1990abouts_) coded rover radios you could choose to ignore the code by some selection of the numbers. Cant remember how though, but it alllowed you to remove the battery and replace it .
I will have to look in the 75 handbook to see if its still possible.

steve001 · 13th March 2008, 10:07

hi guys thanks for all replies, had thought about the jump leads but just wanted to make sure. halfords had said there my be a power surge and could effect the ecu

tigerchubs · 13th March 2008, 11:47

Quote:

Originally Posted by steve001

hi guys thanks for all replies, had thought about the jump leads but just wanted to make sure. halfords had said there my be a power surge and could effect the ecu

I wish I had a pound for everytime I've done it. Years ago while on the spanners I remember notification from Tungstone batteries not to let the power fully down on Rover 800 series, due to some problem with ecu having to be reset if the battery was removed without a back up power source.

We then began to use a device with a 9v household battery connected to an adaptor which was then plugged into the Cigar lighter, we used it on all cars to save radio codes. Not seen one for a few years but should be easy to make using an old phone charger plug, wire and 9v battery.

Jules · 13th March 2008, 12:22

Quote:

Originally Posted by tigerchubs

I wish I had a pound for everytime I've done it.

We then began to use a device with a 9v household battery connected to an adaptor which was then plugged into the Cigar lighter, we used it on all cars to save radio codes. Not seen one for a few years but should be easy to make using an old phone charger plug, wire and 9v battery.

This method works a treat so long as your Cigar socket is PERM live (not isolated by ignition switch)
Most 75's I think are perm LIVE (IRRC)

If not you can make a cigar socket PERM live if can locate the relay that feeds it and simply bypass the contacts with a small link. Check what else it might be supplying though.

Curious_Kiwi · 21st June 2008, 20:11

I also need to change my battery, so I guess it's off to Halfords tomorrow for a new one. Not much else open on a Sunday.

I have a battery charger, so could that be used to maintain power to the system while the battery swap is done?

Or would this fry the system without a battery to soak up the charge?

I also notice on Halfords web site that they have a "memory saver" for £11.99, but of course you need another battery to use this, and a permanently live lighter socket.

Cheers, Paul

PS. The battery that just died is a Yuasa with a Rover part number on it, so I guess it is probably original. If so, not bad to get 8 years out of it :-)

12th March 2008, 15:00	#1
steve001 Newbie rover 75 cdi auto Join Date: Feb 2008 Location: horley Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	changing battery without power loss hi guys, need to change the battery on my 75 but don`t have the code for the radio so just wondering if there is away to change a battery without losing power to the car( i assume that the radio is coded on a 2002 75 steve

12th March 2008, 15:50	#3
GERFIX I really should get out more....... MINI COOPER S Join Date: Nov 2007 Location: Tranent, East Lothian, SCOTLAND Posts: 2,834 Thanks: 0 Thanked 0 Times in 0 Posts	Steve, do you have any of the original paperwork for the car? I found just last night that I have a small credit card-shaped card with the code written on it in amongst all my dealer paperwork and stereo bumph etc. I have the Kenwood set-up in my ZT so that may be something to do with it but it's worth a look. __________________ .......................................Colin http://i245.photobucket.com/albums/g...Cooper-S-2.jpg

13th March 2008, 10:07	#7
steve001 Newbie rover 75 cdi auto Join Date: Feb 2008 Location: horley Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	changing battery without power loss thanks hi guys thanks for all replies, had thought about the jump leads but just wanted to make sure. halfords had said there my be a power surge and could effect the ecu

12th March 2008, 16:02	#4
tigerchubs Gets stuck in Rover 75 CDT+ in Yorkshire Gold Join Date: Dec 2006 Location: Sheffield Posts: 975 Thanks: 0 Thanked 0 Times in 0 Posts	You need another car or battery and a set of jump leads. Connect both cables to the battery or second vehicle, then connect the positive cable to the Rovers positive battery cable (RED), connect the black lead to the engine block. It's now safe to remove your battery without the car being starved of power.

12th March 2008, 16:39	#6
DerekS Posted a thing or two Rover 75 Tourer Join Date: Nov 2006 Location: Malpas Posts: 1,526 Thanks: 34 Thanked 118 Times in 89 Posts	On the older (1990abouts_) coded rover radios you could choose to ignore the code by some selection of the numbers. Cant remember how though, but it alllowed you to remove the battery and replace it . I will have to look in the 75 handbook to see if its still possible.

21st June 2008, 20:11	#10
Curious_Kiwi Newbie 75 Saloon Join Date: Mar 2008 Location: Milton Keynes Posts: 19 Thanks: 0 Thanked 0 Times in 0 Posts	I also need to change my battery, so I guess it's off to Halfords tomorrow for a new one. Not much else open on a Sunday. I have a battery charger, so could that be used to maintain power to the system while the battery swap is done? Or would this fry the system without a battery to soak up the charge? I also notice on Halfords web site that they have a "memory saver" for £11.99, but of course you need another battery to use this, and a permanently live lighter socket. Cheers, Paul PS. The battery that just died is a Yuasa with a Rover part number on it, so I guess it is probably original. If so, not bad to get 8 years out of it :-)