Nice to see someone that is handy.

The current draw is a bit high, but in your case in how you are using it, no worries. I originally put one on my motorcycle and with a 19 Ah battery, current draw makes a difference. Weeks later, my battery might drop from 12.9V to maybe 12.7V.

 

Thank you. For what it is worth, I decided to ameliorate any concerns about the 10mA draw by installing a switch that connects / disconnects the negative terminal of the battery. The super tiny PB-1558 potting box wasn't large enough to accommodate a switch, but I found that if I turned the larger PB-1579 around, I had room to install a small switch in that box (and also contain my connections). When placed side by side, the PB-1558 and the turned-around-PB-1579 neatly consume the entire width of the ashtray.

 

So just to give an update on this thread I started 2 months ago: The car has been running strong so far, after replacing DME relay, battery and the negative strap. I have also started putting it on a battery tender when not driving.

If the problem doesn't appear again, I suspect the new DME relay did the trick.

My alternator charges the battery at 13.6v at 2500 RPM. Not great but decent. I'm keeping an eye on it with a monitor plugged into the cigarette lighter hole while driving. If that voltage starts to deteriorate, I'm ready to rebuild the alternator.

Thanks all for helping!

 

Another 6 months and 3000 miles later, still running strong. Must be the DME relay fix. Consider this case closed. Thanks everyone's help on this forum, my 993 has given me such a rewarding ownership experience so far.