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#4623772 - 01/04/18 12:01 PM '94 Ranger charging at 15.1 volts is this bad?
andyd Offline

Registered: 09/25/04
Posts: 7125
Loc: Marshfield , MA
Freaken Rat. Currently reduced to yard duty. The battery is from my last 528e and about a yr old I plug in the 1/2 A floater at least monthly. Cables are clean and tight. When the truck has warmed up for 10 minutes, idle is down to 900RPM. I put a meter across the power port. 15.1 V. A couple hrs, later I checked the battery voltage, 12.67 V. That is nearly a 100% charge. Resting draw is <25.mA. so the floater is definitely not really necessary if the Rat was used more. Should I be checking the water level in the cells? I want to keep the battery as long as possible. I hope to put it into another old BMW in a yr or so. grin2
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

#4623780 - 01/04/18 12:06 PM Re: '94 Ranger charging at 15.1 volts is this bad? [Re: andyd]
JHZR2 Offline

Registered: 12/14/02
Posts: 41758
Loc: New Jersey
its cold out, the voltage regulator is temperature compensated to some point. Im not seeing an issue if the rested battery is showing 12.67.

A maintenance charge is always prudent.

#4623786 - 01/04/18 12:09 PM Re: '94 Ranger charging at 15.1 volts is this bad? [Re: andyd]
PeterPolyol Offline

Registered: 03/06/16
Posts: 1345
Loc: toronto
^He's right. We get 15V too, but only below freezing and for only a few minutes from a cold start before it scales down to about 14.2V, this is all controlled by the BCM.

#4623801 - 01/04/18 12:18 PM Re: '94 Ranger charging at 15.1 volts is this bad? [Re: andyd]
Miller88 Offline

Registered: 04/09/08
Posts: 12698
Loc: Onondaga County
That's normal after a cold start on a cold morning
18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M

#4624072 - 01/04/18 04:45 PM Re: '94 Ranger charging at 15.1 volts is this bad? [Re: andyd]
Kawiguy454 Offline

Registered: 06/01/15
Posts: 577
Loc: Arizona
13.8 - 14.5 max, More than that constantly and you'll cook the battery. Voltage is pressure and too much forces too much current into the cells. If you rev the engine does the voltage go up? if it does bad regulator.