New to Big Mack. Have issue need help Mack MR no turn signals

[Monty781]

Hello out there. Looking for some help with a Mack MR dual drive refuse truck. The turn signals switches don't work from either side of the cab. I replaced the l/r/ turn signal relay. I swapped the solid state flasher unit with a known good one. Which has power to it. I thought it would be one of these two things as it would affect both sides. I also noticed the amp gauge isn't registering any voltage with truck running or with key in on position. Also the left side throttle pedal isn't working as I switch from drivers side to stand up side it idles down but switch back to drivers side it revs up on its own. May be separate issues but the turn signal issue has thrown me for a loop any suggestions ????

[gearhead204]

is the cab power relay [solenoid] good? I know on my superliner I loose my eng. brake and volt meter if the relay is not working properly