On some of the Models the original Silver Box type Glow Plug Relay (behind the Instrument Cluster) does not function with the new Type of Glow Plugs.

If the original Glow Plug system had a 50 amp strip Fuse on the Fire Wall or no Fuse at all (inside of the Relay is a Reed Switch that will disconnect when the Switch gets hot) I don't believe it can be used with that Relay.

Repair Links
http://www.peachparts.com/shopforum/forumdisplay.php?f=82

http://www.peachparts.com/Wikka/DoItYourSelf

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84 300D, 82 Volvo 244Gl Diesel