To be honest I'm not sure. I've got the 84 733i wire schematic in front of me (Pages 111, and 112), pin 87a or 87b is located in the middle of the relay...to further complicate this the same 5 pin relay listed on rock auto...is also listed as the main relay for the "Jetronic" (?), where as the 4 pin is a totally different Bosch part number.

Here is what the illustration on the Bosch relay (listed for Main and fuel) looks like (hope you can understand my weird punctuation drawing):

86 87 87 (a &b)
o--->|-- o---o
__|____
|__/__|==
o-------| o
85 30

Now from the picture one of the other guys sent me I have the 87 (a/b)relay on the fuel pump going to pin 85 on what I think is the purge valve relay? Does that sound totally pear shaped? Thanks for the help on this man.


PS Picked up a multimeter tonight...nice little digital unit...and forgot the key to the bmw at work errrr! Will check things tomorrow night.

"Aye sir, the more they overtech the plumbing, the easier it is to stop up the drain"
-Montgomery Scott

• Cranks, no start issue, does have spark - pdx733i 2008-04-01 23:37:38 (101 views)
  • Re: Cranks, no start issue, does have spark - ericcue 2008-04-02 20:05:55 (65 views)
  • Are you checking fuel pump relay pin 87 with ignition on or at crank? - demet 2008-04-02 19:34:30 (75 views)
    • Re: Are you checking fuel pump relay pin 87 with ignition on or at crank? - pdx733i 2008-04-02 23:09:48 (71 views)
      • Ok, remove fuse 11 and check for power at crank at each connector. (pic) - demet 2008-04-03 11:59:44 (140 views)
        • I checked for power at crank at each connector, its not quite zero, - pdx733i 2008-04-06 22:26:39 (59 views)
          • Ok, let's recap. - demet 2008-04-07 11:42:27 (54 views)
            • I need a recap, then a nightcap - pdx733i 2008-04-10 19:19:55 (53 views)
              • I always have nightcaps regardless of recaps and sometimes because of them ... - demet 2008-04-10 19:40:31 (64 views)
                • Now, after 'YES' to the first four questions, the FP relay - pdx733i 2008-04-12 19:52:28 (59 views)
                  • Good. The main is working. - demet 2008-04-14 08:56:31 (55 views)
                    • Re: Good. The main is working. - weierj80 2008-04-15 17:16:50 (72 views)
                      • Looking at ETM for 83, 84 I can't see this 5-pin relay with 87b. - demet 2008-04-16 15:05:18 (38 views)
                        • Re: Looking at ETM for 83, 84 I can't see this 5-pin relay with 87b. - weierj80 2008-04-16 20:02:30 (42 views)
                          • Can you post the schematic? (pic) - demet 2008-04-16 21:11:58 (54 views)
                            • Re: Can you post the schematic? (pic) - weierj80 2008-04-18 17:54:32 (60 views)
                              • My 733 now starts and runs: The shop reports excess resistance (nt) - pdx733i 2008-04-19 14:53:41 (38 views)
                                • The shop reports excess resistance at battery ground clamp - pdx733i 2008-04-19 15:03:27 (41 views)
                                  • Re: The shop reports excess resistance at battery ground clamp - weierj80 2008-05-24 19:09:59 (26 views)
                              • Re: Can you post the schematic? (pic) - weierj80 2008-04-18 17:56:47 (50 views)
                            • This is the same info I am working from, from a link - pdx733i 2008-04-17 02:39:25 (31 views)
                          • Re: Looking at ETM for 83, 84 I can't see this 5-pin relay with 87b. - weierj80 2008-04-16 20:12:04 (39 views)
                • So, yes to the first 3 questions, and yes to power at pin 86 with - pdx733i 2008-04-11 23:29:14 (45 views)
                  • Are you checking for power to pin 87 with the relay installed? - demet 2008-04-12 15:42:00 (46 views)
                    • Now, I did and...yes there is battery voltage to both 87's on - pdx733i 2008-04-12 16:53:57 (44 views)
                      • Oh, i also hear the relay click on and off when I install/uninstall it (nt) - pdx733i 2008-04-12 16:55:06 (46 views)
                        • Re: Oh, i also hear the relay click on and off when I install/uninstall it - weierj80 2008-04-13 16:01:55 (39 views)
                • Cheers to that, I'll report back, thanks (nt) - pdx733i 2008-04-11 01:07:50 (37 views)
  • Jumper Main Relay - jasonwilcox 2008-04-02 16:26:18 (59 views)