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The relay clicks under the dash but does the solenoid on the starter click? If you can get a helper, take your volt meter down under the truck and check for voltage at the small terminal on the starter solenoid while the key is turned to the start position. A set of experiments you can do by...

Are your battery terminals clean and tight? When you say one click then nothing, does everything lose power after the click? If you turn the key to start several times, does it click each time? I would start by measuring voltage at the small terminal on the starter solenoid itself while the key...

Twice the available cranking amps. Most diesels have 2 batteries in parallel. The load of 100 amps for 10 seconds from glow plugs combined with 400 amps to spin the starter will make the reason for 2 batteries quite evident.

You dont need an isolated ground alt for that conversion then. If you have an isolated ground alt to use, just ground the post to the engine block. If it is non isolated ground alt, it will ground itself through the housing.

Gm made both alternators isolated ground for ease of supply chain replacement. Any isolated ground alt can be made to function as a standard chassis ground by simply grounding the isolated wire post to the block etc. Think of it as a ladder. The first alternator is grounded to the block and...

Which roscommon conversion are you doing? The batteries parallel single alt 12 volt? If that is the case, don't you already have everything you need? Two 12 volt alternators wired parallel is pointless since their voltage regulator can never be tuned precisely the same; only one of them will do...