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How to test for parasitic draw when the draw kills the battery in 10 minutes?

(1990 Ford F-350)
in Kodiak, AK on April 30, 2017
So I know there is an extreme draw from somewhere but I don't know how to test for it when the volts are dropping that quickly. The previous owner has messed with some wiring and it's referbed 7.3 idi in a 89 f350. I'm not sure how to test for a draw when i only have 10 minutes until the battery dies! any ideas of what i could do to find the issue, before i just start cutting non essentials! Any advice would be amazing! Thank you
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Popular Answer
on May 01, 2017
You're talking dead short almost ... Sparks should be flying when battery cable is touched to battery terminal ... Simply start unhooking STUFF then momentarily touch cable to terminal each time until there is no sparks! ... BE CAREFUL!! ..... Not a recommended DIY repair...

Dual battery system may have one battery that's shorted internally ... I strongly suggest seeking qualified hands-on help!
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on May 01, 2017
Thanks for the advice! I messed around with it for a while with just the positive battery terminal connected, then I disconnected a ton of different circuits one at a time while tested the battery to ground with a test light. I finally found it! The starter solenoid has several other circuits connected to the same post, I tested for a short to ground for each of the wires and one of them has a short... I'm not sure exactly what this circuit powers, but it follows a bus to where all the interior controls are (steering, ignition, lights, ect.) I already pulled all the fuses and that didn't change anything so the short must be before the fuse right? My next step is just braking upon the bus and looking for the short. Once again, thanks so much for the input!
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