Had to remove the battery on my 83/300CDT to clean the front drains last weekend.
After replacing the battery the after market Sony radio/CD player did not work.(Radio is the digital type installed by the previous owner).
Took a voltage reading at radio with key in the ACC position and got 12.6v .
Fuses are OK.
Looks like the radio is gone.
Does anyone have an idea of what could of happened?
I have had the battery on this car disconnected before with no problems, over the years I have done things similar to this (replacing, charging, jumping, radio installation, etc.) with no issues.
Any advice for next time would be appreciated.

Thanks

There should be 2 power wires on the rear of the radio. One holds the memory while the other turns the power off with the key.
Power is usually red with a stripe
Keyed power is usually black with yellow stripe.
Ground is brown.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
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Are you sure there isn't an inline fuse behind the Sony head unit? Lots of installers will tie up the bundle of wiring with Tie-wraps, but it covers an inline fuse holder that may contain a fuse you never knew about until it blew. I'd cut off the tie-wrap and check.

I once blew a 25 amp fuse in my '91 Volvo, replaced it with a 15 amp fuse, which never blew again until I sold the car. Point of which is, why did the fuse blow the first time? Surge?

[This message has been edited by Robert W. Roe (edited 10-13-1999).]

I have pulled the whole thing out and there was no fuse on the red(hot) supply.
The installation was by the car's previous owner and was not a very clean job.
the old unit is from 1994, maybe it was just it's time to go.
I will be replacing the radio this weekend with a new unit.

Thanks for the help.