Electrical problems

i finished installing my amp and bass and when i hooked up the RCA's it didnt work so i have to buy new RCA's in the meanwhile i disconnected the positive cable for the amp from the battery and since then ok the car doesnt have starting problems bu once it starts you know all the bulbs that light up on the dash when you put the ignition key in on, handbrake, coolant, washer, gas all of them stay on with the car running and if i push the gas they slowly dim away and theyll come back on once in a while, the battery in new, maybe this has happened to you, i dont think its the alternator because if it was the car wouldnt start and it starts just fine.


thanx
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1985 190E 2.3 16V (euro)

Cartagena, Colombia