The relays in the engine bay fusebox are helpfully colour coded Yellow and Green. It's also obvious the Yellow are four pin and the green are five pin.
However, closer inspection (and shopping for replacements) you get bombarded with various conflicting numbers. There's the AMR prefixed numbers AMR 2547 (Green) and AMR 2548 (Yellow) which, if I understand it correctly, is the Land Rover part number. Okay. I'm familiar with the idea manufacturers use an internal part designation in their designs to allow them to change their supply source for a part and change the manufacturers part number without impacting all the plans used on the assembly line etc.
However, within the AMR numbers there are several markings which vary enormously one of the format YWB----- e.g. YWB10027 or YWB10032 sometimes with a letter on the end. There's also a little thing stamped on in black of the form R-M- or R-H- e.g. R6M2 or R6H1.
It doesn't take a genius to figure out the "trigger" side of the relay is probably the same in most cases while the "Load" side can vary from a small motor like a washer pump to a big draw item like the EAS compressor.
It seems to me the markings must have embedded information on the maximum current etc. for these circuits. It also occurs to me that LR might change a relay specification for reasons other than supplier changes. For instance they may have originally under-specified a relay, found it burning out or getting hot, then specified a different rating WITH THE SAME INTERNAL PART NUMBER during the model run. If you have a vehicle with the faulty spec then simply replacing like with like will perpetuate the problem...
Question: Is there a master list of all the relays describing their exact characteristics when the model reached the end of its run in 2002 which would allow me to source relays knowing they are absolutely up to date?
However, closer inspection (and shopping for replacements) you get bombarded with various conflicting numbers. There's the AMR prefixed numbers AMR 2547 (Green) and AMR 2548 (Yellow) which, if I understand it correctly, is the Land Rover part number. Okay. I'm familiar with the idea manufacturers use an internal part designation in their designs to allow them to change their supply source for a part and change the manufacturers part number without impacting all the plans used on the assembly line etc.
However, within the AMR numbers there are several markings which vary enormously one of the format YWB----- e.g. YWB10027 or YWB10032 sometimes with a letter on the end. There's also a little thing stamped on in black of the form R-M- or R-H- e.g. R6M2 or R6H1.
It doesn't take a genius to figure out the "trigger" side of the relay is probably the same in most cases while the "Load" side can vary from a small motor like a washer pump to a big draw item like the EAS compressor.
It seems to me the markings must have embedded information on the maximum current etc. for these circuits. It also occurs to me that LR might change a relay specification for reasons other than supplier changes. For instance they may have originally under-specified a relay, found it burning out or getting hot, then specified a different rating WITH THE SAME INTERNAL PART NUMBER during the model run. If you have a vehicle with the faulty spec then simply replacing like with like will perpetuate the problem...
Question: Is there a master list of all the relays describing their exact characteristics when the model reached the end of its run in 2002 which would allow me to source relays knowing they are absolutely up to date?
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