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Unread 01-16-2014, 10:59 AM   #31
Registered User
1976 CJ5 
Join Date: Jan 2014
Location: , AZ
Posts: 16
Originally Posted by plym49 View Post
Not necessarily. A device with chips can be harmed even if it is powered off. It depends on the chips/circuit board and the strength of the pulse.

Remember, chip'd devices are running code - computer programs - on very low power circuits. An induced voltage can physically harm a chip just as a bit or two can flip from 'on' to 'off', or vice versa. Mess up one checksum and whatever it is will not work. Do that on the right (wrong) type of chip and the unit might not come back after a reset.
Thank you, Yes. Which is why I suggested having an older vehicle (without a computer) that is easy to fix.

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Unread 01-16-2014, 11:50 AM   #32
Web Wheeler
1989 YJ Wrangler 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 19,981
The hang up with the pulse is that like you said it can fry electronics not plugged in. The chances of a circuit unplugged being effected is relative to the ciruitry and its capabilty to conduct power. The length of the harness is an equilalent to the secondary side of a transformer. With the circuit unplugged the amount of h field energy coupled is small. The harness of the vehicle however would be subjected to the h field and effectively couple the energy to all circuits connected to it. That is what happens to the power grids in solar flares. The power lines get the current induced on them from the Magnetic pulse generated then carry the current back to the transformers and electronic controls and knock them out. If you disconnect then you can lessen the impact and chances of failure. All electrical wiring become a transformer in a magnetic field. Lighting, alternator, ignition coil and will tranfer power. The diesel idea keeps getting thrown out there. Yes a diesel with a mechanical injection or carb would be better then the electronic controls but you still have wiring, and alternator and they would see the effects as would anything hooked to them like an ignition, Depending on the field generated....even the diesel has potential issue.
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Unread 01-16-2014, 12:43 PM   #33
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Join Date: Dec 2004
Posts: 8,612
We got a hand cranked diesel and pump for water well out at the camp. It has ZERO wires. Get it running and it will just keep going till fuel is gone. Or you close the fuel valve.
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