Slow Cranking, full power to everythiong else

djmtsu · 01-02-2009, 11:44 AM

Forget about voltage when the battery is idle (no high amp draw).

Check the voltage with a GOOD METER (no dashboard gauge) when you are cranking the car.

The battery might have a 'dead cell'. They can show a normal voltage when idle, but when load is applied the voltage drops significantly.

I used to be a DC power technician, so I have a clue.

need RX7 · 01-02-2009, 02:46 PM

Alright, the battery's at Murray's right now getting tested. Whether or not the battery is the problem, I think it's about time for a new one anyway. It's not even the right one for the car, it's effing huge.

Hopefully I can get an Optima.

01-02-2009, 11:44 AM	#1
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	Forget about voltage when the battery is idle (no high amp draw). Check the voltage with a GOOD METER (no dashboard gauge) when you are cranking the car. The battery might have a 'dead cell'. They can show a normal voltage when idle, but when load is applied the voltage drops significantly. I used to be a DC power technician, so I have a clue. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

01-02-2009, 02:46 PM	#2
need RX7 Clean S4 Nutswinger Join Date: Mar 2008 Location: Sterling Heights, MI Posts: 485 Rep Power: 18	Alright, the battery's at Murray's right now getting tested. Whether or not the battery is the problem, I think it's about time for a new one anyway. It's not even the right one for the car, it's effing huge. Hopefully I can get an Optima. __________________ -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.