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  #21  
Old 07-20-2019, 11:12 PM
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That's actually pretty cool that the bat cable takes that path. I have a precision 0.01 Ω resistor for measuring high current so it means i can get an exact measurement of the current to the starter from there


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Old 07-21-2019, 01:48 AM
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You will notice that the diagram is incorrect. It shows the B+ is NOT in the current path to the starter. The reality is different than the diagram.

In reality the alternator and battery and possibly starter join up at the B+ terminal


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Old 07-21-2019, 01:56 AM
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Depends on model year and engine - it's correct in some cases. ;-)
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Old 07-21-2019, 10:52 AM
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I've only every seen that diagram. Always the B+ out on the end not near current path. I haven't looked at mine but not sure which model might actually match the diagram.


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Old 07-21-2019, 04:49 PM
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Quote:
Originally Posted by andrewwynn View Post
I've only every seen that diagram. Always the B+ out on the end not near current path. I haven't looked at mine but not sure which model might actually match the diagram.


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Given that diagram mentions a "water-cooled generator" I'm guessing it applies to the V8s. I'm also guessing that given the use of the term "generator" it wasn't drawn by an electrical engineer...

The diagram certainly isn't correct, from a circuit path perspective - and the actual circuit diagrams (as shown in the TIS documents) don't seem to match what folk are finding in their cars either. And there does seem to be a bit of variation - e.g. my 3.0d has only a single cable at the jump terminal, running down to the starter motor (I think - I'll check more closely when I service it next week)., so no "hot jump terminal" for me.

Such fun... it's like our very own "Tower of Babel".
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Old 07-22-2019, 11:07 AM
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I've noticed it's Typical for BMW to refer to the alternator as generator. It's still a generator just internally generates ac voltage. We've just by convention stopped calling them generator when they switched to AC inside to initially be clear which type it was. They don't call the big wind farm units alternators.
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Old 07-30-2019, 05:32 PM
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The diagram certainly isn't correct, from a circuit path perspective - and the actual circuit diagrams (as shown in the TIS documents) don't seem to match what folk are finding in their cars either. And there does seem to be a bit of variation - e.g. my 3.0d has only a single cable at the jump terminal, running down to the starter motor (I think - I'll check more closely when I service it next week)., so no "hot jump terminal" for me.

Such fun... it's like our very own "Tower of Babel".
So, I said I would look into this (at least on my own car) and confirm what was actually going on and lo and behold, what I had always assumed to be a single-ended terminal - the B+ jumper post - is ACTUALLY a bulkhead pass-through!!

Peeling back the scuttle below the windscreen, I spotted the large battery lead coming up from the back of the car and connecting to the back of the B+ jumper post, via a large bulkhead-pass-though connection.



From there, a large lead runs down to the starter solenoid and then another runs from the starter solenoid to the alternator.

All this can be seen in the following parts diagram, with #6 being the passthrough terminal at the bulkhead. #9 Is presumably the lead to the starter and alternator on the M62/N62 cars (not used on M54/M57 cars): -



So what is in my car doesn't match (exactly) the wiring diagram I posted earlier nor does it match the circuit diagrams in the TIS...

How YOUR car is actually wired may depend on where the starter is located - on my M57TU the starter is directly behind the alternator (left side of engine block) - same as the M54 but on the opposite side for the M62/N62engines, so the diagram above may be closer to what is in the V8 cars.

The important aspect to note is that, like many members have now discovered and in contradiction of most TIS wiring diagrams, the B+ jumper post is a VERY important connection point in the circuit from the battery to the starter and alternator - apparently in all E53 model variants.

Keep it tight and clean, boys and girls...
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