I really didn't want to wait two more days for mail order or to run the risk of my old unit buring a plug and there by dorking a cylinder so I went to the dealership and bought a MB genuine relay. The dealer charged me $174.00 (and no tax, thank you Oregon). Considering the brand new bad unit I got from parts-on-line.net for a $119 plus overnight shipping, I thought the dealer price was reasonable. The unit I got from the dealer works great. Will put a few mile on it on the hiway and see how it holds up.

TimK