(07-12-14, 03:26 PM)Fazerider link Wrote: I'd guess the problem is more down to voltage drop caused by the headlight (if I'm right in thinking that's lit all the time when the ignition's on).
Or a duff battery.
The headlight only comes on when the engine actually starts running. The battery is only a month old and has been drop-tested ok.
Quote:What's the actual voltage measurement across the terminals?
If the battery is freshly charged on the Optimate it can get up to around 13.35v. I'd been trying a few things earlier today and then put it back on charge, so it was around 12.96v when I tried it just now which dropped to about 12.6 when I switched on. When I tried cranking it, it did start, but the volts dropped down to 8.51!
So something, somewhere is draining a lot of power and I presume it's either the starter motor or the ignition system.