PeachParts Mercedes-Benz Forum - View Single Post - OK, where's the fuse in my gp relay- grrrr

Jeremy5848 · #5 06-22-2009, 03:38 PM

You should be able to put a preglow relay from an earlier W124 provided it is a five-cylinder version. I don't know enough about Mercedes model-years to give good advice. The preglow relay from an OM617 will work but you will have to do some rewiring; it will not be plug-compatible.

The circuit breaker in your preglow relay is self-resetting; if it will not reset, you will have to replace the relay. Remember that there may be fuses in the main fuse compartment that cover power to the electronic part of the preglow relay. If one of those fuses is bad, the relay won't work. Likewise, the over-voltage protection relay (OVP) and its built-in 10 amp fuse may need to be good. I don't know how similar your car is to my '87, which is what my wiring diagrams are for.