Where can I find a wireing harness for a 1996 Dodge ram 2500 Diesel ? I need the headlight harness

They are an aftermarket addition.

https://www.google.com/search?q=2014+Dodge+Ram+2500+HID+projector+style+headlight+wiring

https://www.google.com/search?q=mobile+auto+electrician+near+me

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1997 3500 Wiring Diagram - Dodge Diesel - Diesel Truck Resource Forums

www.dieseltruckresource.com/...dodge-ram.../1997-3500-wiring-diagra...

Jan 24, 2011 - Hey guys, I'm working on a 97 3500 that's had the bed removed and replaced with a flatbed. There is the biggest mess under that truck wiring wise and. ... 2007 Ram 3500 A/C compressor wont engage, need wiring diagram ...

Dodge Wiring Diagrams / Schematics - YouTube

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https://www.youtube.com/watch?v=UI6_vhCHFYU
Nov 19, 2013 - Uploaded by Robert Nauert
Dodge Wiring Diagrams / Schematics ... Nitro, Power Wagon, Ram 1500, Ram 2500, Ram 3500, Ram 4500 ...

1997 Dodge Cummins - Full color wiring diagrams - 12 Valve ...

forum.mopar1973man.com/.../1638-1997-dodge-cummins-full-color-wi...

I hope the diagram/wire colors are readable.

Headlights are not fused. More likely bad switch or corroded connections

Any Dodge dealer or auto repair shop can print one out for you.

Not too much amperage. HID lights use less amps. Duh. The circuit is showing a failure in the HID kit from not enough amps so it turns off. You need to add a resistor.

Here's a link to a pdf file containing the headlight wiring diagram for your year model Dodge Ram 1500..
I can't help but notice that you say you've replaced the headlight relay? That's quite odd, because there is NO headlight relay on this vehicle- only a 40 amp fuse located in the power distribution box that sits behind the battery inside the engine bay.
The switch is notorious for burning out because there is NO RELAY on this vehicle, and there is a recall (#819) but this only affects 3500 models even though the headlight wiring is the same for 1500,2500 and 3500 model Rams.
Here are two more links that will help you troubleshoot your headlights problems.
HereInformation on Putting a Relay in the Wiring System

hope this will work

Sir I can help you with this, I have all the service manuals on your truck and will provide anything you need, but this honestly sounds like a bad wire connection or ground on a primary battery cable. I would trace all my battery cables and clean every connection even the engine ground cable and the one at your starter. I will be glad to help you further, I can post step by step trouble shooting guides on your truck if you need them. Hope this helps.

1996 dodge van 2500 oil leaking from top is this my pressure gauge