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According to the manual (somewhere), my 87 300SDL already uses the
relay, though I am not sure about 86.
<p>"T.G. Lambach" wrote:
<blockquote TYPE=CITE>The "black box" is the glow plug relay. If it "acts
up" you should know
<br>that Bosch and Beru make retrofit glowplug relays that extend the glow
<br>time in order to reduce smoke at start up. These may be cheaper than