cam.in.head Posted April 16, 2017 Share Posted April 16, 2017 There are a couple of different (maybe more)different part number type relays that are used .some are marked pa4and I believe some are marked pa6 with a different Bosch number. Are these only variations of the same thing or is one for a 4 cylinder and one for 6 cylinder versions. They all interchange and work either way but are there any differences..? .also do some have 87 and 87b as isolated sections or are they all from the same relay single contact ? .gonna check myself but just wondered especially after my recent episode Quote Link to comment Share on other sites More sharing options...
cam.in.head Posted April 18, 2017 Author Share Posted April 18, 2017 Just tested every single pump relay I have and all are single contact types where 87 & 87b are permanently joined.so it appears there are no major differences between part numbers.googling 87 & 87b relays does show some types where 87 & 87b is unconnected together until relay is energised but our systems obviously don't need this feature. Quote Link to comment Share on other sites More sharing options...
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