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Old 07-17-2011, 04:34 PM
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Join Date: Jun 2011
Posts: 14
Question 1983 380SEC electrical issues

I'm have some electrical issues with the 380SEC I'm working on.

1st the battery is draining after a couple of days of sitting. It's a new battery.

2nd The radio was working, but wont turn on now. The fuse is good.

Could these issues be related?

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Old 07-17-2011, 05:14 PM
compu_85's Avatar
Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
Sure. Simple test:

Remove the + cable from the battery. Get a small test lamp (a couple watts) and hook it between the cable and battery. If the light glows brightly you know something is drawing at least as much power as the light is rated for. Disconnect fuses on at a time until the light goes out. You don't have to totally remove fuses, you can just lift up on the tabs to disconnect them for a moment.

When the light goes out you have found the circuit which is drawing the current. You can continue your troubleshooting from there.


1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
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