Stock Voltmeter Reading? - Ford Powerstroke Diesel Forum
 
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post #1 of 9 Old 11-07-2008, 08:31 PM Thread Starter
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Stock Voltmeter Reading?

Hey guys.... I'm having a few electrical issues. I'm almost positive it's an alternator issue. Everything makes sense, except the voltmeter in the dash. It's readings don't match up with what I think it should be telling me, and it's throwing me off.

So my question is, where does the voltmeter in the dash get its reading from??? I wish I had a wiring diagram for this truck!

Thanks guys!

2001 F250 (Extended Cab, Short Box)
7.3L, ZF6 Swap, NV271, 5.5" Lift, 37" BFG Baja Military Tires, Recentered Powder Coated H1 Wheels, DIY Intake, 3.5" Exhaust, Autometer Gauges, '05 HD Headlights, and TW Tuned!
1979 F150 (Regular Cab, Short Box)
460 BBF w/ Nitrous, C6, NP203, 14B FF Locked, HP D60 w/ Spun Inner C's, 5.13 Gears, 39.5" Boggers, Built Bumpers, Warn M12000, Built Front Radius Arms, Built Rear Shackle Flip (in progress), and much more... Build Thread/Wheeling Pics @ FSB!
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post #2 of 9 Old 11-08-2008, 07:40 AM Thread Starter
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Anyone????

2001 F250 (Extended Cab, Short Box)
7.3L, ZF6 Swap, NV271, 5.5" Lift, 37" BFG Baja Military Tires, Recentered Powder Coated H1 Wheels, DIY Intake, 3.5" Exhaust, Autometer Gauges, '05 HD Headlights, and TW Tuned!
1979 F150 (Regular Cab, Short Box)
460 BBF w/ Nitrous, C6, NP203, 14B FF Locked, HP D60 w/ Spun Inner C's, 5.13 Gears, 39.5" Boggers, Built Bumpers, Warn M12000, Built Front Radius Arms, Built Rear Shackle Flip (in progress), and much more... Build Thread/Wheeling Pics @ FSB!
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post #3 of 9 Old 11-08-2008, 08:01 AM
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It comes off one of the plugs on the alt. What is the voltage reading at the alt??

1997 F250 XLT CC PSD 4X4 4.10LS E4OD (AB CODE TRUCK)
DFUSER 18K MOD
4" TURBO BACK DI EXHAUST
1705 SUPERCHIP
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GAUGES,EGT,TRANS,BOOST,OIL TEMP,OIL PRES,WATER,VOLT
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1996 F250 XLT EC PSD 4X4 4.10LS E4OD
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QUAD POD WITH EGT,TRANS,BOOST,WATER
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post #4 of 9 Old 11-08-2008, 08:10 AM
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Multi-meters are good..

Who cares what the dash says, get a meter out.

Whats going on to make you think its the alt?


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post #5 of 9 Old 11-08-2008, 08:12 AM Thread Starter
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Yeah, I was messing around with the multi-meter last night.

In the dash, sometimes it's around 14V, where it should be, but sometimes it drops anywhere between 8V and 12V.

I guess I have a bad alternator. Probably cheaper to get it rebuilt.

2001 F250 (Extended Cab, Short Box)
7.3L, ZF6 Swap, NV271, 5.5" Lift, 37" BFG Baja Military Tires, Recentered Powder Coated H1 Wheels, DIY Intake, 3.5" Exhaust, Autometer Gauges, '05 HD Headlights, and TW Tuned!
1979 F150 (Regular Cab, Short Box)
460 BBF w/ Nitrous, C6, NP203, 14B FF Locked, HP D60 w/ Spun Inner C's, 5.13 Gears, 39.5" Boggers, Built Bumpers, Warn M12000, Built Front Radius Arms, Built Rear Shackle Flip (in progress), and much more... Build Thread/Wheeling Pics @ FSB!
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post #6 of 9 Old 11-08-2008, 08:13 AM
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eh...could be a bad alt, could a a bad batt as well killing your voltage. Gotta make sure..could be something as small as a loose connection. Lots of possibilites, do a little poking around before you go swapping parts.


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post #7 of 9 Old 11-08-2008, 03:50 PM Thread Starter
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Yeah.... We poked around today. The one battery was definitely bad.... Replaced it. But I'm still having issues. I think the alternator is bad too. Earlier today, after running the truck for a bit, the alternator got really hot!!!! When I get back into town, I'm going to get it tested. Half the time it works, half the time it doesn't?!

2001 F250 (Extended Cab, Short Box)
7.3L, ZF6 Swap, NV271, 5.5" Lift, 37" BFG Baja Military Tires, Recentered Powder Coated H1 Wheels, DIY Intake, 3.5" Exhaust, Autometer Gauges, '05 HD Headlights, and TW Tuned!
1979 F150 (Regular Cab, Short Box)
460 BBF w/ Nitrous, C6, NP203, 14B FF Locked, HP D60 w/ Spun Inner C's, 5.13 Gears, 39.5" Boggers, Built Bumpers, Warn M12000, Built Front Radius Arms, Built Rear Shackle Flip (in progress), and much more... Build Thread/Wheeling Pics @ FSB!
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post #8 of 9 Old 11-08-2008, 07:30 PM
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its possible that you had a bad batt for a long time and managed to burn out the alternator.

So the alternator is what 150-200 bucks? (not sure for your truck) replace it and be done with it before you kill the new battery.


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post #9 of 9 Old 11-08-2008, 07:32 PM Thread Starter
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Quote:
Originally Posted by kinghawg98 View Post
its possible that you had a bad batt for a long time and managed to burn out the alternator.
Yeah, that's what we figured as well.


Quote:
Originally Posted by kinghawg98 View Post
So the alternator is what 150-200 bucks? (not sure for your truck) replace it and be done with it before you kill the new battery.
I'm actually going to look into getting the alternator rebuilt.... This guy is awesome, he's already done a few for me, and he's giving me warranty on them. And it's cheaper than buying a new alternator.

2001 F250 (Extended Cab, Short Box)
7.3L, ZF6 Swap, NV271, 5.5" Lift, 37" BFG Baja Military Tires, Recentered Powder Coated H1 Wheels, DIY Intake, 3.5" Exhaust, Autometer Gauges, '05 HD Headlights, and TW Tuned!
1979 F150 (Regular Cab, Short Box)
460 BBF w/ Nitrous, C6, NP203, 14B FF Locked, HP D60 w/ Spun Inner C's, 5.13 Gears, 39.5" Boggers, Built Bumpers, Warn M12000, Built Front Radius Arms, Built Rear Shackle Flip (in progress), and much more... Build Thread/Wheeling Pics @ FSB!
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