AO Silver Member
Join Date: Apr 2002
Re: 156 has been off the road, battery now flat
During my entire time in the Autotrade I have never ever heard of anyone destroying anything by jumpstarting a car. Except from the few occasions when some jerk managed to mistake blue from red.
However, these are the simple rules for jumpstarting a car;
1. Connect positive with positive on both cars.
2: Connect negative cable on donor car to negative ground on receiving car as far away from battery as possible. We don't want any H2 explosions, do we?
3: If necessary, start donor car
4: Start "the patient"
5: Let both cars idle for at least 10 minutes.
6: Stop the donor car
7: Remove negative ground from the patient, then from the donor
8: Remove the "positive" cable.
What we should be cautious of;
A: Sparks igniting H2 vapours from the batteries
B: Current peaks when disconnecting cables
C: Messing up the self learning procedure of the ECU
The current peaks can arise when simply detaching the cables, but more often when the donor car is trying to charge both cars and at the same time supply the heater, heated rearscreen and who knows what anciliaries that are turned on in the receiving car. When the jumper cables are disconnected, the alternater all of a sudden over charges the donor car and in the process might end up killing several controlling units.
The self learning procedure mess up isn't a big issue on Alfa's, but is known to be a bit of a problem on Peugeot's and Mitsu's