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'94 Ranger charging at 15.1 volts is this bad? #4623772
01/04/18 01:01 PM
01/04/18 01:01 PM
Joined: Sep 2004
Posts: 7,518
Marshfield , MA
andyd Offline OP
andyd  Offline OP
Joined: Sep 2004
Posts: 7,518
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
Re: '94 Ranger charging at 15.1 volts is this bad? [Re: andyd] #4623780
01/04/18 01:06 PM
01/04/18 01:06 PM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,085
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.

Re: '94 Ranger charging at 15.1 volts is this bad? [Re: andyd] #4623786
01/04/18 01:09 PM
01/04/18 01:09 PM
Joined: Mar 2016
Posts: 1,351
toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,351
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.

Re: '94 Ranger charging at 15.1 volts is this bad? [Re: andyd] #4623801
01/04/18 01:18 PM
01/04/18 01:18 PM
Joined: Apr 2008
Posts: 12,854
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,854
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
Re: '94 Ranger charging at 15.1 volts is this bad? [Re: andyd] #4624072
01/04/18 05:45 PM
01/04/18 05:45 PM
Joined: Jun 2015
Posts: 653
Arizona
Kawiguy454 Offline
Kawiguy454  Offline
Joined: Jun 2015
Posts: 653
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.


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