Quote Originally Posted by streaky View Post
Here's the latest.
After a few hours drive I reached the campsite. Turned off the engine and could hear an almighty whistle coming from under the bonnet.
Closer inspection found the Yellow top has a type of porus vent that was making the whistling....pretty loud it was too!

One chap made comment that the Piranha DB180S might be over charging the battery. I put a meter on and got 12.8v at the battery without the engine running.

Could his theory have any merit?

Thx.
Your battery is over pressurising because of over temparature probably because of overcharge. At this stage I'd look into your Piranha or alternator. For drainage, need to eliminate one by one possibility. Disconnect alternator first and then fuses one by one while measuring current drain from the battery.

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