I need a glowplug relay for my 80 300SD and I just found one for 322.00!! Is this a normal price?

$250-350 is pretty normal for a brand-new unit. Search fastlane above for examples.

the one for my 83 300SD is only about 150. Does anyone know the difference? Is it possible to swap out the glow plug wiring with that of an 81 or newer and use the cheaper relay?

The W116 used a different (older) style realy, so i dont think they are swappable without some re-wiring.

I found the realy on *************** for $259 or $299 depending on your model. I work for the supplier of *************** i can get you the relay for about half the cost, i can have it shipped to anywere in the US for $12 with USPS if youd like.

PM me.

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Current:
05 E320 CDI
07 GL320 CDI
08 Sprinter
05 Dodge Cummins
01 Dodge Cummins

Previous
2004 E55 AMG
2002 C32 AMG (#2)
1995 E300
1978 300D
1987 300D
2002 C32 AMG(blown motor :[
1981 300SD
1983 300SD
1987 300SDL
2002 Jetta TDI
1996 S420
1995 S500
1993 190E 2.6
1992 190E 2.3
1985 190E 2.3 5-Speed