Battery light, 14.5 volts from alternator, remote start not working......

1955moose · Feb 8, 2018

I just got off phone with a friend that was a dealer Ford mechanic for over 30 years, and concurred with me. You should have milliamp voltage between negative terminal, and cable, not close to 12 volts battery voltage. You've got a dead short causing your voltage to ground. Stamp or bedrck has this one, as this is their expertize. I'm going to back away, and let the pro's diagnose this one.

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deweysmith · Feb 8, 2018

Oh I misread the 12.78 voltage drop… yeah this is out of my league.

RFink · Feb 9, 2018

Weather’s not good, might look at this weekend if it warms up a bit...

Bedrck47 · Feb 9, 2018

Cold here also Might not reply until the temps get in the 80's No big hurry here

Notice the word MIGHT does it mean you will or maybe or just saying the hell with it

PHILLY PHILLY

RFink · Feb 9, 2018

Should be in the 50s, all depends on the honey do list...

knewblewkorvett · Feb 12, 2018

I just had an alternator go nuts in my 2000 XLT. It went to 17 plus volts (wow, the dash indicators sure go nuts), blew up my battery and fried my subwoofer amp. Replaced the alternator (and battery)and it was putting out 14.5 volts but I still had the battery light on (in the dash). I was confused. Replaced the alternator with another and all is fine now.

theoldwizard1 · Feb 12, 2018

The battery disconnect is a red herring, but it does show that there is a significant load on the system. If the alternator is continuously charging at 14.5 volts, it will kill the battery. It should drop down to about 13.8-14.0 after running for about 5-10 minutes.

First, find a "voltage drop across fuse" chart. There are dozens on the internet.

Second, put your disconnect in the ON (closed/down) position.

Third, with the key in the OFF position, start checking the voltage drop across all of the fuses in the fuse box under the hood. Using your chart you will see how much current each circuit is pulling. Anything over about 100 mA is too much.

RFink · Feb 13, 2018

I did check it after driving yesterday, still getting almost full voltage on the negative cable. Terminal to terminal is only .01 -.02 higher. Milli amp reading was .12-.13. I’ll do the fuse voltage drop test tomorrow, thank you.

RFink · Feb 15, 2018

I have no fuses under the hood, just pax kick panel

RFink · Feb 27, 2018

Update, I do have a small fuse box in the engine bay, has to be Ford/aftermarket add ons, alarm sys etc. Haven’t had a chance to check it out. Need to replace front wheel hubs at the top of the list.

Battery light, 14.5 volts from alternator, remote start not working......

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