voltage question
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4th Gear
Joined: Aug 2023
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From: fl.
voltage question
1996 f-150 truck 5l. battery voltage not running 12.78, running no load 14.32, running with ac &lights 14.8, after driving around 10 miles with full load on battery voltage 13.91, all these voltage checks made at battery with volt meter. guage in truck running with no load showing right of center. with full load on battery guage showing just left of center. these guage readings are while truck is at highway speed around 55mph. is what i am seeing a guage problem or a charging issue. thanks for any help!!!
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4th Gear
Joined: Aug 2023
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From: fl.
what is it ?
Lead Driver
Joined: Sep 2002
Posts: 9,550
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From: North Texas
When you turn on the A/C you also power on the blower fan. I do not know the total amp draw of the system running, but I would guess probably 15-20A with the blower on high. Your alt is either 95A or 130A. The 130A will handle it better than the 95A.
You are making a stink for no reason, accessories draw amps in use. The gauge reacts at times, just how these trucks are built. The system checks out as you have tested it, just drive on.
You are making a stink for no reason, accessories draw amps in use. The gauge reacts at times, just how these trucks are built. The system checks out as you have tested it, just drive on.
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4th Gear
Joined: Aug 2023
Posts: 4
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From: fl.
When you turn on the A/C you also power on the blower fan. I do not know the total amp draw of the system running, but I would guess probably 15-20A with the blower on high. Your alt is either 95A or 130A. The 130A will handle it better than the 95A.
You are making a stink for no reason, accessories draw amps in use. The gauge reacts at times, just how these trucks are built. The system checks out as you have tested it, just drive on.
You are making a stink for no reason, accessories draw amps in use. The gauge reacts at times, just how these trucks are built. The system checks out as you have tested it, just drive on.
Cargo Master
Joined: Jan 2004
Posts: 3,118
Likes: 149
From: South Dakota
thanks for your input, my gauge has always went back to right of center under full load ac, lights. it is only going left of center with ac on.it's never did this before. could it be ac compressor is having a problem? there again belt is good and no noise from anything. thanks for help
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WIth no load, not running, the batt shows 12.8. Normal. With eng running and small load the alternator is charging the batt, showing right of center on the guage (and 14ish on your voltmeter). Normal again. With a load on it, it shows left of center because the batt is putting out more than it's currrently being charged by the alternator. Again, normal. Hope that helps.
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4th Gear
Joined: Aug 2023
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From: fl.
WIth no load, not running, the batt shows 12.8. Normal. With eng running and small load the alternator is charging the batt, showing right of center on the guage (and 14ish on your voltmeter). Normal again. With a load on it, it shows left of center because the batt is putting out more than it's currrently being charged by the alternator. Again, normal. Hope that helps.
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devil421
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Jul 31, 2002 08:26 AM