HEC Battery voltage.
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Senior Member
Joined: Aug 2003
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From: Susquehanna Valley, pa.
HEC Battery voltage.
My Batt light just came on and i don't have any tools or a multimeter with me!
Since i just put a new battery in a couple of weeks ago i suspect the ALT. I just checked the connections and they look good.
In the Odo test mode the Batt displays 152. even when revving the engine. is this too low? How high do the numbers go on a correctly functioning truck.
Since i just put a new battery in a couple of weeks ago i suspect the ALT. I just checked the connections and they look good.
In the Odo test mode the Batt displays 152. even when revving the engine. is this too low? How high do the numbers go on a correctly functioning truck.
Battery voltage gauge will indicate present battery voltage.
93-102 6.2-9.1 volts, low voltage
115-124 8.5-10.7 volts, Normal band start
215-225 15.8-18 volts, Norm band end
230-241 16.9-19.1 volts, high voltage
93-102 6.2-9.1 volts, low voltage
115-124 8.5-10.7 volts, Normal band start
215-225 15.8-18 volts, Norm band end
230-241 16.9-19.1 volts, high voltage
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
Look at your center two HEC lines.
10.7 is the start of the normal band.
18 volts is the end of the normal band.
152 is between these points. (125-215)
The numbers are in Octal. So if you were to work out the progression, you should find that 152 is equal to between 11.5 and 12.5 volts.
At this value, this suggests the system isn't charging.
A fully charged battery should float at a running level about 14.4 +/-.
That should register in the 180 to 190 range to be close to equivelent depending on the charge rate.
I just checked my HEC value for a cold start and recharging the battery and it shows 189. Did not measure the voltage at the battery. It's to cold out to take much extra time and being dark.
Hope this gives you somewhat a reference.
May be alternator time again.
It is not a good idea to install a replacement alternator against a near dead battery, so keep this in mind. It causes the alternator to go wide open right from the git-go.
Good luck.
10.7 is the start of the normal band.
18 volts is the end of the normal band.
152 is between these points. (125-215)
The numbers are in Octal. So if you were to work out the progression, you should find that 152 is equal to between 11.5 and 12.5 volts.
At this value, this suggests the system isn't charging.
A fully charged battery should float at a running level about 14.4 +/-.
That should register in the 180 to 190 range to be close to equivelent depending on the charge rate.
I just checked my HEC value for a cold start and recharging the battery and it shows 189. Did not measure the voltage at the battery. It's to cold out to take much extra time and being dark.
Hope this gives you somewhat a reference.
May be alternator time again.
It is not a good idea to install a replacement alternator against a near dead battery, so keep this in mind. It causes the alternator to go wide open right from the git-go.
Good luck.
Thread Starter
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Senior Member
Joined: Aug 2003
Posts: 1,921
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From: Susquehanna Valley, pa.
well, it was the ALT. i took it off and had it tested. it was bad so i bought a reman with a lifetime guarantee and a new belt. stuck them both on and put the charger on to fully charge the battery.
it is ok now and the HEC is at 190.
I got it done just in time because its starting to snow.
it is ok now and the HEC is at 190.
I got it done just in time because its starting to snow.
