Ya I'm pretty sure the thick black from the bellhousing goes up to the battery negative, think its just bundled in with the thick red for the starter from memory (which is poor lol).
Yup I'm still using the orginal sierra fusebox with all of the redudante relays removed. Theres definately some common earths coming out of it. If you look at the wiring diagrams in the service manual, it shows one in cell G3 on diagram 1 for models after 1990 for example.
No I've not tried shorting the starter and up till now I've assumed the battery is still good as it's fairly new but obviously has been sitting since xmas when I last ran the engine. I'll have to check the charge on it tonight to see if that's the problem.
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