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weird electrical problem b230k

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Old Mar 20th, 2019, 15:09   #11
lixah
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After disconnecting the test battery, did you then disconnect the alternator and reconnect the test battery just to make sure everything else is ok Matt?
no - but i will do that, thank you
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Old Mar 20th, 2019, 19:52   #12
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At least changing the alternator is quite easy. Try to get an identical replacement. Volvo used (at least) both Denso and Bosch. If you fit the wrong one you may find you’ll struggle to get the belt tension right without replacing the bracket and or the belt.
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Old Mar 21st, 2019, 21:41   #13
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It sounds, pun intended, as if the alternator is still wet, it might not be damaged or not badly damaged.

It might work or be economically repairable when it has eventually dried out.

Like an electronic device that someone known to me dropped in to a volume of water. Eventually it came back in to daily use in their life.




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Old Mar 21st, 2019, 23:18   #14
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so quick update, not had much free time, did just pop out to see if i could do anything, took the battery off, and connected to charger directly to the car terminals, the same thing happened, popped the fuse in the charger...
Surely charging an isolated battery (if you did, your text is confusing) would be the easiest thing for a charger : ergo, your charger is knackered.
I'd bite the bullet and buy a brand new battery, and later a new charger
£60ish, I got mine delivered next day for £56 (I think) UASA from a shop with a weird name.
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Old Mar 21st, 2019, 23:45   #15
Laird Scooby
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Originally Posted by Dirty Rooster View Post
Surely charging an isolated battery (if you did, your text is confusing) would be the easiest thing for a charger : ergo, your charger is knackered.
I'd bite the bullet and buy a brand new battery, and later a new charger
£60ish, I got mine delivered next day for £56 (I think) UASA from a shop with a weird name.
He connected the battery charger leads in place of the flat battery - later he borrowed another battery and got smoke billowing from the alternator.

Brief conclusion is it seems the alternator is FUBAR and possibly taken the battery with it.

https://advancedbatterysupplies.co.uk/product-tag/027

Staqndard battery for a B230 powered 740/940, choice of several there all with free next day delivery. Used that places a few times now.

As for the alternator, a decent autoelectricians should be able to diagnose the fault (probably rectifier gone short circuit) and fix it and/or supply a reconditoned unit - almost certainly a Bosch on the 740 which i'm fairly sure Matts car is.
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Old Mar 22nd, 2019, 16:32   #16
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ok pretty certain ive found the problem

on a side note one of auxilary terminals had become dis-connected from it's crimp connector but i dont believe that's been the cause of this.

I borrowed a battery connected that one up, and i could hear a hissing noise and saw some small amount of smoke coming from the alternator, so that's pretty certainly my culprit. So sourcing a new one is next on the order!

I guess this is what I get and a good lesson, don't be lazy, always take just a minute to protext your electrical components whenever water is nearing your engine. I can't really imagine a worse outcome, now i need a new alternator and battery, lol. lesson learned!

thanks for the replies everyone. I will update as/when it's fixed too

Regards, Matt
Are you confident as to was it smoke or water vapour? It can be not easy to tell the difference, especially if one's priority has become to switch off quickly.

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