Isolators and Alternators.

I'm hung up on a wiring issue. I'm installing (2) battery isolators. A chunky manual switch on the negative (for when the car is in transport or storage) and a Motorsports electronic isolator on the positive (MSEL) . There are 100 arguments on the order of the major components around the isolator. According to HPA, the FIA states that the alternator is on the non battery side of the isolator. In other words, the isolator would cut off the alternator from the battery. This is also how the MSEL instructions read. Common sense says that if the isolator cut off the battery while the engine is running that the alternator would destroy every piece of electronics in the car (all Haltech). The MSEL isolator is “suppose” to send a signal to the ECU (via dry contact signal) to shut down the engine. This would need to happen crazy fast ?? I'm thinking of putting the starter (main feed) and the alternator on the non isolated side. Then have the isolator cut off everything except those two high current items. Thoughts ??[img="blob:https://www.hpacademy.com/f6f97478-dd1d-45e2-b639-a629f6560b45" alt="" id="mf_1235F167-D6E7-417D-9047-BDD1515169BD/L0/001" class="x-apple-edge-to-edge" style="-webkit-text-size-adjust: auto; width: calc(100% + 48px); margin-left: -24px; font-family: UICTFontTextStyleBody; font-size: 19px;" aria-label="Mail.messageViewer.inlineAttachment.image0.jpeg" ]

I can tell you that disconnecting the battery on an vehicle with the engine running and the alternator supplying power will not "destroy every piece of electronics" what happens is the engine keeps running. The alternator provides as much current as the devices need, and the voltage is limited by the voltage regulator (which has been part of the alternator for the last 50 years or so). So you are counting on the MSEL signal to have the ECU stop running the engine. Some manual master switches will switch in a load across the 12V to avoid damage to an alternator if there were no load, and simultaneously disconnect the ignition switch power, so the engine (even carbureted ones) will stop running with no power to the ignition coil.