This just happened last night and seeing as the shop near me is closed for the weekend I was hoping to maybe get some ideas on what may be the culprit. Have a 1997 80 series with ~230k miles. When I put the key in the ignition and turn it to the accessories, everything lights up and sounds fine. But when I turn it one more to the on/start position, it seems the entire electrical system shuts down. Everything goes dark, no light, no radio, nothing. Checked the battery, over 12v so it's not that (tested battery bot when static and trying to crank). When looking under the hood and someone else turns the ignition to start, I can hear a click and a popping sound before everything goes dark. When trying to start it in the truck, I can hear clicking noises from the radio after things go dark. Sometimes I have to insert the key back in the ignition multiple times after a failed start to get the electricals to come back online. Anyone else ever have a similar issue??