Alan Reeves Posted October 6, 2018 Share Posted October 6, 2018 I had my car in with the two steves during the week for an ECU tweak and they found that on the various readouts.The battery readout dropped to about 11v just switching the ignition on ?Once started the Alternator need around 2000 revs before it actually kicked in?I know nothing about electrics but does this seem right, Steve was questioning it.Alanps, anyone local can teach me how to use a multimeter ( Gatwick area) Link to comment Share on other sites More sharing options...
revilla Posted October 6, 2018 Share Posted October 6, 2018 That sounds to me as though your battery is not very healthy. Check the electrolyte levels (assuming it's a standard Banner?) and if OK, I'd think about replacing it. Link to comment Share on other sites More sharing options...
Tony Whitley Posted October 6, 2018 Share Posted October 6, 2018 Multimeter: I fitted a USB socket with a voltmeter like this into my dash I can check the voltage at any time (as well as charging a phone + satnav). Link to comment Share on other sites More sharing options...
Alan Reeves Posted October 6, 2018 Author Share Posted October 6, 2018 Checked the battery a few weeks ago but will recheck ...and that USB has been ordered...thanks Link to comment Share on other sites More sharing options...
Ian B Posted October 6, 2018 Share Posted October 6, 2018 Oh no! Alan, step away from the wiring loom! Link to comment Share on other sites More sharing options...
Alan Reeves Posted October 6, 2018 Author Share Posted October 6, 2018 I agree...blind n blindBattery seems fine and was not dryi put those proddy things attached to a box and it showed 12.1 its in pgm tuesday so they can give it a checkA Link to comment Share on other sites More sharing options...
anthonym Posted October 6, 2018 Share Posted October 6, 2018 Funny things charging circuits Link to comment Share on other sites More sharing options...
anthonym Posted October 7, 2018 Share Posted October 7, 2018 I have just fitted a Brise and when I checked this morning there was no alternator charging activity until I increased the engine revs a bit. I (now) have an increased size pulley which I expect is causing this and by design. Some cars rev so highly (think track use) they make the alternator go more slowly by installing a bigger pulley, so as to protect it (the alternator). Whether I actually want that behaviour I have to have a think as I don't do tracks.. much... the 'ring occasionally. Link to comment Share on other sites More sharing options...
revilla Posted October 7, 2018 Share Posted October 7, 2018 @Alan if it reads 12.1V with no load it's not very happy. Ideally 12.6-12.7V. It doesn't sound like a big difference but it is. Link to comment Share on other sites More sharing options...
anthonym Posted October 7, 2018 Share Posted October 7, 2018 @Tony Whitley I've been thinking (given I already have a volts reading in the Stack dash) I could add one of those down at the solenoid so that (even if briefly) I could see the actual voltage (drop) down there which over time would show me the deterioration and warn me when to replace the wire(s). Just have to make sure I take the earth from the same place as the Stack, currently (!) I have no idea where that is. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted October 8, 2018 Member Share Posted October 8, 2018 What type of alternator, and what wires are attached? What ECU?...The battery readout dropped to about 11v just switching the ignition on ?As revilla says.What was the minimum voltage during cranking?...Once started the Alternator need around 2000 revs before it actually kicked in?What's the voltage at immediate idle, at 3,000 rpm, and at subsequent idle?...Does your charging warning light work?Jonathan Link to comment Share on other sites More sharing options...
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