From digest.v7.n649 Mon Nov 24 22:08:21 1997
From: ingraham_at_ssl.berkeley.edu (Curtis A. Ingraham)
Date: Mon, 24 Nov 1997 13:59:55 -0800
Subject: <E28> Radio dies when applying brakes
In BMW Digest v07.n643 Ron Stygar <RonStygar_at_aol.com> wrote:
> Any idea why my sweethearts ''84 528e Sony radio dies when she applies
> the brakes? I realize that they share the same circuit (fuse 12).
It's a classic E12/E28 electrical problem. When the brake lights come
on, the voltage on that circuit dips enough to cause the radio to 'reset'.
It's worse for certain radios (my Sony did that) and for loose fuses or
You can try cleaning the fuse contacts and installing a new fuse.
If that doesn't work, you can install a relay: wire the coil between
ground and the radio lead from the ignition switch. Connect one side of
the normally open contacts to the radio power lead and the other side
to a stiff 12-volt source, such as the cigarette lighter supply.
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