Help ID where ground wire goes

[Colbycheese]

Okay I'm working on a 91 suburban with the 5.7. One of the two wires that ground on the thermostat housing has been cut up for a trailer brake the truck no longer has. Can someone please tell me where the connector that someone has spliced the two white wires into is supposed to go exactly? Thank you

 

[Jawzjeep]

Just went and checked my 91 suburban and the only white wires in that area for me goes to the injectors and the only other white wire I can see goes to the throttle position sensor. In your pic you have a wire loom coming from behind the brake booster area that I don't have.

You must be registered for see images attach

if it wasn't pouring I'd take a few more pictures

Two white wires going through a loom together to me seems like something somebody else added on. I might follow him back into the harness and see if they were spliced back there