1988 Columbia Car Par questions

[monacayankee]

Hello, I recently bought a 1988 Columbia Car Par and I am trying to get it running. So far I have drained the gas tank and all the fuel lines and replaced the fuel pump. I am having some issues getting it to run.

It will only attempt to start when reverse is selected. I have looked at the diagram for the solenoids and am going to test those later after I get the motor to run in reverse at least. Is it mostly likely a bad solenoid for the forward circuit or could it be that the wiring needs the connections cleaned?

What is the little grey box underneath the starter solenoid that has a green wire going to it and a yellow one coming out to the starter solenoid? Its riveted on. The yellow wire pulled out of the connector when I was messing with it and the nut wont unscrew because it's rusted. I just ran the green wire to the yellow directly. Will that mess anything up?

What is the best procedure to clean the carburetor? It is a Walbro carb.

Can I get the solenoids at lowes or someplace?

Thanks everyone.

It has the five solenoid system.