k0ua
Epic Contributor
The volt meter did not cause the spark. The fact that there was current flow because the battery was a lower voltage than the charger voltage causes current to flow. With current flow, there will be a spark at initial contact.Had one blow in my face once. Was using an old garage size charger that had a volt and amp meter. I'm supposing the small load from the volt meter caused a spark when I disconnected the cable. Charger was turned off.
Fortunately I pulled my head to the side fast enough I didn't have any eye damage. There was an outdoor faucet nearby and I washed myself off good then sprayed down the car.
I disconnected the volt meter in the charger. I've never seen a charger before or since that had a volt meter.