1987 e28 528- Instrument cluster wiring

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  1. 1987 e28 528- Instrument cluster wiring 
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    Evening folks,
    Been changing the batteries on the e28s instrument cluster but im wiring new ones outside the cluster to save hassle in future. Im just after some advice as to me wiring it all up properly. Heres a couple of pics, the first one is with the wiring done and the cluster reassembled but the batts got hot when i connected it up:

    Ive connected 2 wires to the + terminals and the same with the negatives, spliced them and then onto the 2 1.2v nicads but as i said the batteries heat up quick. I THINK ive wired it properly but not sure, maybe its normal for the batteries to heat up?

    Ive placed the old batts in the order they sat in the cluster for comparison :

    This is the other end :

    Appreciate any advice guys so i can get the cluster back in the car
     
     

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    Dr of BMW gildersol's Avatar
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    Never seen one of these. At one end of the batteries, on the pcb, are the + and - not commoned, so that the batteries are in series.
     
     

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    watty17 (19-08-2011)

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    Quote Originally Posted by gildersol View Post
    Never seen one of these. At one end of the batteries, on the pcb, are the + and - not commoned, so that the batteries are in series.
    Yeah mate theyre set up opposite ways like a tv remote.
     
     

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    If they are commoned at one end on the pcb then you only need to connect a positive and negative wire from your battery pack to the + and - at the opposite end on the pcb
     
     

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    watty17 (20-08-2011)

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    Quote Originally Posted by gildersol View Post
    If they are commoned at one end on the pcb then you only need to connect a positive and negative wire from your battery pack to the + and - at the opposite end on the pcb
    Oh right.

    So would i just connect 2 wires onto the short wires of the batteries and onto just one + and minus terminal on the board? Never done this before like and dont want to blow anything.

    Edit: When the original batteries were on the board the were side by side and facing opposite ways lengthways.
    Last edited by watty17; 20-08-2011 at 13:27.
     
     

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    You need to look at the pcb to see if one end of the batteries are commoned + to -, then connect your 2 battery pack wires to the other end. If they are not commoned at one end you should run 4 wires, one from each end of the new batteries to each of the 4 connections on the pcb.
    Don't connect anything if you're not sure.

    By the look of your photo (which is a bit blurry) you may be fortunate if you haven't already blown something

    Not sure if this is readable
    Attached Images
     
     

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    Quote Originally Posted by gildersol View Post
    You need to look at the pcb to see if one end of the batteries are commoned + to -, then connect your 2 battery pack wires to the other end. If they are not commoned at one end you should run 4 wires, one from each end of the new batteries to each of the 4 connections on the pcb.
    Don't connect anything if you're not sure.

    By the look of your photo (which is a bit blurry) you may be fortunate if you haven't already blown something

    Not sure if this is readable
    Could read most of it and thats the order theyre set up on the board.

    These pics any use to you? http://www.bimmerforums.co.uk/forum/...738/page2.html

    Im not touching it again till im sure
     
     

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    Can't tell from these
     
     

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    Quote Originally Posted by gildersol View Post
    Can't tell from these
    I cant upload any more till the mrs gets back

    At one end of the batts on the board theres 2 terminals/ tabs, a plus for one and a minus for the other, same the other end. Ive got 2 wires from the negatives, spliced into one and onto the negative on the battery pack. Ive done the same with the positives and onto the positive wire on the battery pack.

    Im not into electrics but i thought that would work fine.
     
     

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    If the batteries are 1.2v each and are meant meant to be connected in series to give 2.4v, then you have just short circuited your battery pack which is why they got hot.
    If you look at the pcb where the batteries connections are, can you not determine whether they are commoned at one end.
    I know your pcb won't look like this but in a AA battery pack one end would be like this where the metal joins from one battery to another.
    Attached Images
     
     

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