I have a similar device in my old Electron Ford Escort - a ZEVA fuel gauge driver plus. It works quite well with the old Ford analog gauges. http://www.evwest.com/catalog/product_info.php?products_id=144 You might try their setup file - might be the same device as the one you have, just made in Australia. Tom Keenan
> On Oct 25, 2016, at 1:05 PM, Rick Beebe via EV <ev@lists.evdl.org> wrote: > > I have a 1998 Ford Ranger (http://evalbum.com/4674) that I bought as a > lead-acid EV and converted it to Lithium. In the process I replaced > almost everything. I bought an AutoblockAMP from RechargeCar (sadly, > discontinued). It's a slick hall-effect current sensor that measures > current and counts amp-hours. It outputs a pulsed signal to show amps on > a tach (works great). It has another line that puts out 12v to light up > a "low battery" light at some specified threshold and a third one that, > I believe, uses PWM to ground to simulate a variable resister to drive > the fuel gauge to show SOC. > > I have the service manual for the truck and indeed it shows a single > wire from the gauge to the sensor in the tank. 22ohms empty and 240ohms > full (that's from memory so don't quote me). The problem is it doesn't > work. Connecting that wire to ground through any resistance does > nothing. The engine computer (PCM) was removed during the initial > conversion. The fuel sensor wire also went to the PCM but I don't see > anything in the wiring diagram that should influence the gauge. What I > have discovered is that I can make the gauge work by supplying voltage > rather than a connection to ground. 2volts is empty and 9volts is full. > > I haven't got a clue as to the piece of magic that the PCM (or some > other wire) must have provided such that the gauge is now "backwards." > So I've tried seeing if I can convert the AutoblockAMP signal. My first > attempt was to use it as 1/2 of a voltage divider and that sort-of > worked except for finding the right value to drive the gauge full scale. > Plus if, while I'm adjusting the ABAMP and I get too close to one end > of the scale the resister burns up. My second attempt, thinking it was a > PWM signal, was to use a PNP mosfet. That looked promising but isn't > driving the gauge linearly enough. It goes from full to empty in the > first quarter of the SOC. > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20161025/cf78ae58/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
