Porsche 964 c2 battery replacement
Discussion
hi there
This is a bit of a silly question (probably) but I do a fair bit of tinkering however I have never (not even on my 67th vehicle) ever had to change a battery myself.
If anyone owns a 964 could they talk me through it - any little things I need to look out for and of course general advice is welcome. I have the battery sat next to car and im sick to death of having to jump it. Tonight is the night!!
Many thanks in advance....
This is a bit of a silly question (probably) but I do a fair bit of tinkering however I have never (not even on my 67th vehicle) ever had to change a battery myself.
If anyone owns a 964 could they talk me through it - any little things I need to look out for and of course general advice is welcome. I have the battery sat next to car and im sick to death of having to jump it. Tonight is the night!!
Many thanks in advance....
Howard- said:
Locate battery
Disconnect positive terminal
Disconnect negative terminal
Unbolt battery
Lift out
Lift up new battery
Place new battery where old battery went
Bolt new battery in
Connect negative terminal
Connect positive terminal
Make a cup of tea to celebrate a job well done.
You missed a step...Disconnect positive terminal
Disconnect negative terminal
Unbolt battery
Lift out
Lift up new battery
Place new battery where old battery went
Bolt new battery in
Connect negative terminal
Connect positive terminal
Make a cup of tea to celebrate a job well done.
Spend 3 hours searching for Radio Keycode...
Impasse said:
For unintended consequence's sake, I would ensure that the alarm/immobiliser is in its "disarmed" state (which would include the doors being unlocked) and at least one window is wound down before disconnecting the battery.
Thanks for that - I don't think this cobra alarm thing has an "off" setting - just basically doesn't work if the car is dead. It did do one wiesrd thing where it would sort of say"woo-woo" in a pathetic dying sheep sense if the battery was draining. So I unplugged whatever that sensor was under the engine lid. I hear horror stories of setting fire, welding spanners to bodies (presumably cars) and all sorts of general nastiness....so I thought id ask the gurus.
Howard- said:
Locate battery
Disconnect positive terminal
Disconnect negative terminal
Unbolt battery
Lift out
Lift up new battery
Place new battery where old battery went
Bolt new battery in
Connect negative terminal
Connect positive terminal
Make a cup of tea to celebrate a job well done.
This is weird my name is actually HowardDisconnect positive terminal
Disconnect negative terminal
Unbolt battery
Lift out
Lift up new battery
Place new battery where old battery went
Bolt new battery in
Connect negative terminal
Connect positive terminal
Make a cup of tea to celebrate a job well done.
I've always disconnected the negative first. And reconnected the negative last.
I think it's engineering best practice.
There's a (albeit small) chance you could short the battery if your socket/spanner touches anything while undoing the positive with the negative still connected. ( on negative earth vehicles at least..)
I think it's engineering best practice.
There's a (albeit small) chance you could short the battery if your socket/spanner touches anything while undoing the positive with the negative still connected. ( on negative earth vehicles at least..)
mechagran said:
FredClogs said:
You missed a step...
Spend 3 hours searching for Radio Keycode...
almost everywhere I have looked has said disconnect negative first.. is there a reason for this and why you don't? Appreciated btw just curious. Spend 3 hours searching for Radio Keycode...
If you are nervous, connect the new battery using normal wire and crocodile clips BEFORE you remove the old one so that the 12v supply is never interrupted. Keep it all connected together until the new battery is fully installed, then remove the crocodile clips and take away the old battery.
Unlock the car with the fob and open / shut driver's door to disable the alarm.
Find a small spare 12v battery (not the new battery), connect this using some spare wire (fused if at all possible, but not essential) positive to positive, negative to negative to the battery connectors on the car making sure you can still undo the terminals with the slave leads on.
Undo whatever is holding the battery down.
Undo the negative terminal first (not really needed if you're using a slave battery as the positive terminal would still arc, but it's best practice).
Undo the positive terminal.
Remove old battery carefully without knocking the slave leads off.
Fit new battery.
Refit positive terminal and tighten.
Refit negative terminal and tighten.
Refit battery hold down device.
Remove slave leads.
Pray the radio code survived.
Find a small spare 12v battery (not the new battery), connect this using some spare wire (fused if at all possible, but not essential) positive to positive, negative to negative to the battery connectors on the car making sure you can still undo the terminals with the slave leads on.
Undo whatever is holding the battery down.
Undo the negative terminal first (not really needed if you're using a slave battery as the positive terminal would still arc, but it's best practice).
Undo the positive terminal.
Remove old battery carefully without knocking the slave leads off.
Fit new battery.
Refit positive terminal and tighten.
Refit negative terminal and tighten.
Refit battery hold down device.
Remove slave leads.
Pray the radio code survived.
DO NOT disconnect the positive first. If you allow the live lead to touch the bodywork (which will be earthed out through the battery, as you haven't disconnected the negative/earth lead) you can very easily cause an electrical fire. At best you'll blow a few fuses/relays and melt some wiring loom but you'll be amazed how quickly a fire can start from this simple mistake. And the same for reconnecting, make sure the positive is the first to go back on. 
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