Slow Cranking, full power to everythiong else

RETed · 01-02-2009, 12:09 AM

Sounds like a bad battery...

What is the voltage with everything off?
Ideally it should be over 13.0VDC.
What is the voltage while cranking?
Ideally it should be over 10.0VDC.

The engine can crank down to 9.x VDC, but if it gets any lower than that, the battery is no good.

-Ted

need RX7 · 01-02-2009, 03:06 AM

It sits right at 12v with the key turned to on and the parking/dash lights on (I couldn't see anything without them ha) I walked away for a couple minutes (with the parking lights on) and it had dropped to about 11v. So I guess I'm off to get a new battery...

I'll still check out the grounds and stuff just in case... Thanks for the help guys.

01-02-2009, 03:06 AM	#2
need RX7 Clean S4 Nutswinger Join Date: Mar 2008 Location: Sterling Heights, MI Posts: 485 Rep Power: 18	It sits right at 12v with the key turned to on and the parking/dash lights on (I couldn't see anything without them ha) I walked away for a couple minutes (with the parking lights on) and it had dropped to about 11v. So I guess I'm off to get a new battery... I'll still check out the grounds and stuff just in case... Thanks for the help guys. __________________ -Ted -1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status. -1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress. Last edited by need RX7; 01-02-2009 at 03:09 AM.