soldave Posted February 7, 2021 Report Share Posted February 7, 2021 Question for you all: are the heaters in these things particular drains on the battery? Have been driving recently with the heater on and have noticed that when it's on power 1 my voltmeter drops right onto the 13V mark; on power 2 it drops a little below that. All of my other accessories can be on and make almost no difference to the voltage. First thought was the alternator not giving me enough voltage but it was rebuilt probably 12-18 months ago so shouldn't be that I hope. It could very well be taking all the power of the car to turn the fan as it does seem to squeak and rattle a little when I initially turn the heating on! Quote Link to comment Share on other sites More sharing options...
EXCEL V8 Posted February 7, 2021 Report Share Posted February 7, 2021 A single fan on my early system draws 12A on turn on and 8A when running (full speed). So: 2 x 8 = 16A. 16A x 12V = 192 Watts. Like having two extra sets of headlights on! Pete 1 Quote Link to comment Share on other sites More sharing options...
soldave Posted February 13, 2021 Author Report Share Posted February 13, 2021 Good point. Maybe I shouldn't be surprised then! Throw in a bit of a drain on the battery through less than smooth bearings on fan, bad earths etc and it all adds up. Quote Link to comment Share on other sites More sharing options...
EXCEL V8 Posted February 14, 2021 Report Share Posted February 14, 2021 I'm currently searching for a compact alternator with a higher output for just this reason. Hoping for some feedback from a local rebuilding company soon. Pete 1 Quote Link to comment Share on other sites More sharing options...
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