Hello All.

I have a 91 350sdl with the Becker 2 piece unit. The car was bought off of an estate, owner passed away.

I knew the radio did not work when purchased. Sent units off to be checked out, both came back ok, seperate and together.

Prev owner had the 8 amp white fuse in the fuse box tin-foiled so that it delivered as much current as the circuit wanted!

I replaced the tin-foil fuse with a correct one.

Put the radio back in, coded it and nothing happens. Went to the rear amp unit and sure enough the fuse blew. A 7.5 amp fuse is present. book calls for a 5 amp.

Nothing on the radio works when you turn it on, except the antenna goes up and down.

Oh, the previus guy also cut the two supposed anti-theft and cellphone wire off the one female connector.

Seen this once on a later model 126. Has 2 seperate amps behind the rear seat backrest, one was shorted. Acted this same way.
Remove the rear seat cushion, then the backrest, you'll see the 2 amps. Try disconnecting both of them, then plug one in, check the fuse, unplug both, then plug in the other one, check fuse again.

Gilly

Thanks for the advice. Can't I just pull the
"audio out" wires leading out of the receiver/amp:
that would be the red, white-yellow and blue wires
one at a time to figure out which amp is shorted?

Hi fj bertrand,
By disconnecting the plugs you are talking about you would only interrupt the audio signal and not the power to the amps which is at the amps. You will need to disconnect them one at a time to see which one or both are shorted. If you need the serviced let me know. I stock most of them for exchange.

Cleeve Morrison
La Jolla Audio Repair

www.lajollaaudiorepair.com