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flatheadmurre · 02-23-2020, 12:35 PM

Disconnecting the battery when running an alternator gives you voltage spikes up to 120v...for very short periods mS since the alternator stator is a big inductor(coil).
If you have any electronics in the car like fuel injection i wouldn´t try my luck.
Most cars with electronics has voltage clamps keeping it under 40v above that voltage regulators of ECU´s fry fast....but they take so much then you can toast them to.
Bulbs or a fan motors etc don´t care about it since it´s for a blink...but solidstate is fragile if unlucky.

02-23-2020, 12:35 PM	#9
flatheadmurre Senior Member Join Date: Apr 2015 Location: Sweden Posts: 3,045	Re: 6 V Positive Ground Disconnecting the battery when running an alternator gives you voltage spikes up to 120v...for very short periods mS since the alternator stator is a big inductor(coil). If you have any electronics in the car like fuel injection i wouldn´t try my luck. Most cars with electronics has voltage clamps keeping it under 40v above that voltage regulators of ECU´s fry fast....but they take so much then you can toast them to. Bulbs or a fan motors etc don´t care about it since it´s for a blink...but solidstate is fragile if unlucky.