problems with disconnecting positive terminal from battery first?

[feraldisco]

Hi - disconnected the positive terminal on my battery on 99 Td5 Disco on the weekend to clean up some grunge and apply vaseline. On reconnecting, everything seemed fine apart from having to enter the radio security code...all dash warning lights etc fine. However, there is now a clicking noise coming from the engine bay fuse box, even when the ignition is off - I can't pick out which fuse it is though. I then read my instruction manual (yes, I know, I should have done this first) and it indicated that negative should be removed before positive to avoid damaging ABS and other electrics. The ABS warning light on the dash turns on and off fine...so I hope I haven't done something stupid and expensive!?

Interestingly, the motor actually seems to run better now, so I'm wondering if the ECU has been reset (I thought you had to also remove the main fuse for about 5 mins for this to happen?)

Cheers

[LesDef]

Gidday feraldisco,

Can't help with details about the TD5 electrics.
When putting vaseline on the battery terminals it should not be placed on the contact surfaces. This may create a resistace. Just encase the exposed areas of the terminal to prevent oxidising.

Rgs Lesdef

[100I]

also can't give any help with TD5 specifics but general practice to remove -ve first and fit last to avoid accidental shorting with a spanner to the +ve.

[drivesafe]

Hi feraldisco, like the above, I can’t give you direct help with the noise but as stated above, always remove the battery’s negative terminal first and if you have a dual battery set up, no matter what type of isolator is in the system, including just a battery switch, you should also disconnect the auxiliary battery’s negative terminal as well and disconnect all battery negative terminals BEFORE you disconnect any positive terminals.

Also as posted above, connect ALL positive battery terminal before you connect ANY battery negative terminals.

Next, try disconnecting the negative terminal again and leave it off for a few minutes and then reconnect and see if the noise has gone.

Cheers.

[rovercare]

Gidday feraldisco,

Can't help with details about the TD5 electrics.
When putting vaseline on the battery terminals it should not be placed on the contact surfaces. This may create a resistace. Just encase the exposed areas of the terminal to prevent oxidising.

Rgs Lesdef

Vaseline-Petroleum jelly is fine for the contact surfaces

[lokka]

Id say that the disconecting of the battery would have reset your ecu each time u service them u should re set the ecu so it knows if theres a new filter or oil or what ever as things like filters become less effective and the computer makes allowances for it u need to re set them when things get replaced

[loanrangie]

Slightly ot, but are there any probs if disconnecting the battery on a tdi disco with the alarm or imobiliser ?

[rovercare]

Id say that the disconecting of the battery would have reset your ecu each time u service them u should re set the ecu so it knows if theres a new filter or oil or what ever as things like filters become less effective and the computer makes allowances for it u need to re set them when things get replaced

Where did you get that "information" from

Sounds like it came from an interesting source

[tombraider]

Where did you get that "information" from

Sounds like it came from an interesting source

Hmmm, yes... My BS detector just went off

[tombraider]

Mate.... Your giving engine management systems WAY to much credit!