Service 4x4 warning light on.

That's your fuses check the accessory fuses they're also labeled parking accessory is the fuse you need to change on that one and make sure you don't put a higher fuse than what it requires

Here is JD Powers specs on the Dakota

https://www.nadaguides.com/Cars/2001/Dodge/Dakota-Pickup-1-2-Ton-V6/Quad-Cab-Sport-SLT/Specs

The Internet, though, has a large number of web sites
where you can buy service manuals and schematics
from bookstores, publishers, and other collectors.
Here is just a sampling of what sites are out there:

Factory Auto manuals
http://www.factoryautomanuals.com/
search for : factory service auto repair manuals

Repair Service Manuals
http://www.repairservicemanuals.com/
the largest collection of Automotive Repair Service
Manuals and Owners Guides on the internet. Our
database currently holds over 54,000 entries
dating back from 1940 to more recent 2011.

about Chilton Repair Manuals
http://www.chilton.cengage.com/

about Haynes Repair Manuals
Haynes Publishing
Haynes auto manuals
http://www.haynes.com/

Bad Wheel Bearing = Vibration while braking? - DodgeTalk : Dodge ...

www.dodgetalk.com > ... > 3G Dodge RAM - General Talk

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2006 dodge dakota p/u - Discussion on Topix

You seem to have a short circuit, or bad circuit breaker. Most newer trucks use breakers instead of fuses for high amp circuits. Could you have run over something which tore a wire under in part of the 4 WD circuit? Pull fuses/breakers one at a time and try again until you find the one which kills the noise, then repair that circuit.

How man rpms are you at when your are cruising at 60mph?

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

It could be a cam or crank sensor. Have someone plug a OBD II reader in and pull all the codes.
That will give you some idea.
Please let me know what you find.

i don't think that daytime running lights came out on them until 1998 or 1999

the only thing i will recomend you now is to have a load test done to the batterie, this will be done with a batterie tester,
because if voltage is not good when first start then accesories might not work proplelly untill batterie charged

same issue... my battery "green" is not there..... I will replace battery tommorrow... I put a battery charger on it and it was low. hope this helps.