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to735i
12-28-2002, 04:27 PM
After some excellent advice on a previous post, I've decided to go ahead and replace the main relay. However, I'm having a tough time locating the correct part number for this piece. None of the numbers on the relay seem to follow the typical BMW scheme.

The current relay in the car has the following characteristics:
What appears the be the part number: 1.708.647 -or- 899685
12V, max.2x15A
5 prongs: 30, 85, 87b, 86, 87

|30
85| --87b |86
--87

The following diagram is printed on the relay:
<img src="http://mail.roadfly.org/to735i/OrigRelay.jpg">

I tracked down a relay in town that appears to be close, but I wanted some advice before putting in the car and causing damage:
<img src="http://mail.roadfly.org/to735i/PossibleRelay.jpg">

As always, thanks for the help!

to735i
12-28-2002, 04:36 PM
I forgot to mention that I did search the archives, and saw that someone mentioned that the correct part number for an '85 is #0 332 014 112. However, looking at this picture of it, it doesn't appear to match:

<img src="http://mail.roadfly.org/to735i/0332014112.jpg">

Thanks!

BoomerD
12-28-2002, 05:40 PM
Baased solely on the diagram you posted, the part number for that relay is 12-63-1-708-646 with the supplement S1537 04/86 Not sure if this IS the main relay, but it's the part number for the relay with the schematic you posted.
Hope it helps.

to735i
12-28-2002, 08:46 PM
Thanks for the info.

I'm not sure if it's the correct part for the main relay; No telling what the PO did, or had done - There is always chance that the wrong relay was installed. Finding the "right" part number is probably what I'm really after.

Just as a sanity check: I pulled this relay from the firewall on the passenger side of the engine compartment. As far as I could tell, this was the only relay on that side of the engine-bay. This is the main relay, right?

Thanks!

edward
12-29-2002, 12:05 AM
...new replacements are white plastic - Just FYI... dono about part #'s as I am away from my studio, but I'll check it in the morning...

Edward

BillB
12-29-2002, 09:40 PM
I bought mine at Kmart auto area about 10 yrs ago, for less than $5. It was a Bosch, these are very standard relays used in the auto industry for yrs. Sometimes I would make things more complicated than they have to be.
Good Luck
BillB

BillB
12-29-2002, 10:01 PM

TLK
12-29-2002, 11:29 PM
Just want to you to know that the relay you bought isn't the same as the original one you've got!

Your relay diagram shows "87" and "87b". Those are both tabs connected to the same place. When the relay is triggered, both will get connected to 30. When not, 87 and 87b are not connected to anything.

The one you bought is a standard relay of a different type. When the coil is unenergized, 30 is connected to 87a. When energized, 30 is connected to 87.

That's not the same relay. Please don't put it into your car!

BillB
12-30-2002, 01:49 PM


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