Please help ID these wires and plug

[Ol'Blue]

Plug was laid down along the frame under drivers side floor. Two wires go up to driver side firewall then in behind dash.

Wires look to be white with purple stripe or purple with white stripe.

Thanks

 

[Ol'Blue]

....and plug end

 

[DirtDonk]

Looks like the connector for the brake warning light switch. Unfortunately, it looks like the switch broke off and is what's sticking out the end of the connector.

Paul

 

[DirtDonk]

Have a look down on your frame rail. Do you still have the factory H-block (or prop valve if this is a '76/'77) there?

Paul

 

[Viperwolf1]

Brake imbalance switch wires. Looks like part of the switch is broken off of the distribution block or proportioning valve.

 

[Ol'Blue]

Ahha! Yep

Connects to the pin on top of prop valve?

I'm going to hydroboost next month and plan to us this adj prop valve.

http://m.summitracing.com/parts/wil-260-11179?seid=srese1&gclid=CNaJ5NTV6MkCFc5gfgodA_ENQw

Is this compatible with the brake warning light?

Thank you both!