Batteries connec/disconnect

[eric242340]

I seem to remember this being on the forum once before. Well, ive just bought my own copy os Mercedes Benz WIS (Workshop Information System) and it takes up a lot of hard drive. Howver its very good and all the dealers use it. In there it clearly states Quote; Always disconnect the negative terminal first and always connect the positive terminal first.

 

[television]

I seem to remember this being on the forum once before. Well, ive just bought my own copy os Mercedes Benz WIS (Workshop Information System) and it takes up a lot of hard drive. Howver its very good and all the dealers use it. In there it clearly states Quote; Always disconnect the negative terminal first and always connect the positive terminal first.

The main reason is a safety issue, should the spanner used touch the chassis or any exposed metal part of the car no damage is done. Doing the + terminal first on a recentlly charged battery could cause an eplosion.

Malcolm

 

[and11]

- first?

The main reason is a safety issue, should the spanner used touch the chassis or any exposed metal part of the car no damage is done. Doing the + terminal first on a recentlly charged battery could cause an eplosion.

Malcolm

So its negative terminal first both times? I've got two that will need charging when i get home.

 

[television]

So its negative terminal first both times? I've got two that will need charging when i get home.

No when you put it back,do the + first and the - last.

Malcolm

 

[wireman]

To be quite clear disregard the polarity (you may have an older classic with pos earth),

Disconect the grounded side first and reconnect the ground side last.

I have seen the result of getting a spark off the high (ungrounded side) via a spanner and watch strap, the owner of the arm in the watch strap now knows that you do it the way that MB tell you. His spanner is now a piece of scrap steel.

 

[Glenn Smith]

This is normal practice on any vehicle, not only can sparks burn or ignite a battery giving off hydrogen (when being charged) it can also cause voltage spike through the electronic systems on the car possibly causing damage.