Kobeck,

Sorry,

I'm not familiar with removing the GP on an '87 engine even though I have an '87 300SDL. I am familiar with R&R the GP on the older 4 and 5 cylinder engines but it looks like the new engines are more difficult to do the GP. Maybe someone else can help you.

If the engine started by the screw driver method, the good GP worked and the engine started. This shows that your old GP relay is OK. The new GP relay will probably blow the fuse the same way. That's why the fuse is there, so you don't melt the wires from having a shorted GP. Can you return the new relay you bought because I'm sure you old one is OK? Don't install it or you might not be able to return it. You should have asked here before you ordered it.

You can do the test I explained about connecting the GP across the battery with no other tools than 2 Vise Grip pliers or equilvalent tools. Even a set of jumper cables would allow you to check the GP this way.

Maybe you are in a higher tax bracket than I am but $60 for new set of GP when only one is needed is too costly for me. I just replace the bad GP. If you replace all the GP, keep the good old ones for spares, you probably will eventually need them.

P E H