Sounds like you have a voltage level problem could be either plus or minus. Start with hooking up a voltmeter to the power bus behind the dash panel. Run the motors play with tabs & panel lights see what the supply voltage is. If its low your problem is gonna be from the power bus back. If the voltage is good the your problem is somewhere between the instrument panel and the power bus. If the problem is there try running jumpers both plus and minus between the power bus and meters and see if it goes away.