Hi, I brought a w201 out of a old ladies yard. My fuel pump isn't coming on. I need to test the relay but I don't want to blow the switch. Any ideas or suggestions other than a mechanic? Tryna save money. And don't have that much to spend.

Hi for starters ,remove all the relays and clean the pins with contact cleaner and reinstall .next replace All the fuses with fresh ones from a fuse kit ,cleaning the contact tangs as well
The relay may requiring resoldering but its best replaced along with the OVP
mak

Thanks. Would anyone happen to have a diagram of the fuse box on my car? Or know where I can get one?