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That pulsing when loading the circuit is a classic symptom of a bad connection. Had this about 3 days after I got my truck home from auction. It was a bad/dirty connection on the polarity box 12V terminal. It had not arced or got hot so simple cleaning fixed the issue. When troubleshooting...

You don't need to download one manual, you need to download ALL 9 of them. You will find electrical troubleshooting in the -1 manual, which will lead you to a specific repair in chapter 7 which is found in the -3 manual. I would not print any of them, they are thousand pages long In many cases...

1997 makes yours an A0 alright... What tenmonger said, there is a complete set of A0 manuals available in the manuals section of this site which is the first section at the top of the main/home page. There is an electrical schematic in the back of every manual. If you send me an email...

Yep, the LBCD(circled in red) is only on the A1 and as mentioned senses battery voltage and load and controls the load disconnect relays(circled in green) Via,the other connections/wires. The A0 polarity protection box only has the large diodes, 4 terminals and just the 6 large cables...

Well the box could be a polarity protection box, thats why we need the year and model as it will tell us what schematic to look at to give you troubleshooting tips. If the box is between the tire and the air cleaner and about in the middle of the vehicle, that may be the polarity box. But the...

Yep, what truck model. Could be a bad DC connection or bad ground. Could be a LBCD on an A1 truck or a polarity box on an A0. Could be a main relay or even a main switch or any of the associated wiring. The not restarting till cool is a great clue and can also be a valuable troubleshooting...