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Old 11-24-2019, 08:47 PM   #1
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What are these missing wires on my 96 SMB Ram Van B3500?

I've got a new-to-me 1996 Ram Van B3500 and when looking at the battery there are 2 connections that seem to have been pulled out... Any idea what these are? The only thing I can think that it might be would be related to the furnace and furnace fan. When I set my thermostat the furnace doesn't click on and no fans start. All fuses appear intact. Thoughts? They are at the positive terminal and seem to terminate to the same connector as the largest cable (though, I am not sure what that cable is.)
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Old 11-25-2019, 06:37 AM   #2
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You're talking about a 25 year old van, could be anything. If you have a typical SMB setup the furnace is usually wired from the house fuse block in the back somewhere, like under a bench seat or in a cabinet. It should be pretty easy to trace the wires from the furnace to the wiring source.

To be clear, it's very unlikely that your furnace was ever wired to the chassis battery.
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Old 11-25-2019, 07:30 AM   #3
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You're talking about a 25 year old van, could be anything.
On top of that, it looks like this particular example lacked any sort of aux fuse block. I see a half dozen crimp connections there, which I presume are all ring terminals stuck to the same battery terminal?

This might be a good candidate to just rip out all the non-OEM wiring and start over....
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Old 11-26-2019, 09:36 AM   #4
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Originally Posted by carringb View Post

This might be a good candidate to just rip out all the non-OEM wiring and start over....
Definitely the route I'd go---nothing worse than tying into another's wiring and "hoping" for the best. Ya know never know what the interconnecting wire leads to or what damage its suffered when the PO or whomever ran that wiring.
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Old 11-26-2019, 10:29 AM   #5
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Quote:
Originally Posted by 86Scotty View Post
You're talking about a 25 year old van, could be anything. If you have a typical SMB setup the furnace is usually wired from the house fuse block in the back somewhere, like under a bench seat or in a cabinet. It should be pretty easy to trace the wires from the furnace to the wiring source.

To be clear, it's very unlikely that your furnace was ever wired to the chassis battery.


Judging by the carpet I don’t think that’s the “chassis battery”. It lives underhood on the drivers side. The picture is not very informative, we need a better perspective, maybe a wider angle.
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