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81 CJ 258 starting problem
Jeep and Willys Vehicles Discussions on Jeep and Willys vehicles. (rec.autos.makers.jeep+willys)
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#21
 
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Re: 81 CJ 258 starting problem -
04-01-2007
, 08:35 PM
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"Jeff Strickland" <crwlr (AT) verizon (DOT) net> wrote in message news:szAPh.368$jZ3.275 (AT) trnddc06 (DOT) .. "Mike" <mik (AT) localnet (DOT) com> wrote in message news:ClwPh.5969$ya1.4904 (AT) news02 (DOT) roc.ny... "Greg" <greglc84 (AT) hotmail (DOT) com> wrote in message news  _uPh.4647$aG1.3248 (AT) pd7urf3no (DOT) ..I read the rest of the replies, mostly argueing about resistence, anyway Mike I cleaned all connections on bat. solinoid, and alt. only one I didn't clean was one down at starter, and starter and bat cables are about a year old. Bill mentioned at some point bat. was disconnected while running, that didn't happen, but when I thought the bat. was dead the other day I used my battery charger which has a setting for 70 amps to start a vehicle, which I used and it arced when disconncting it. I replaced everything on engine when I put a rebuilt in 1 1/2 years ago, all but alt. Am I now ready for that? First start with a known good battery. A fully charged battery should read around 12.65 volts. The voltage reading you got when ckecking your battery, 11.96, indicates a battery that is 80% DISCHARGED. 80% discharged!? No, how about 20% discharged?. Actually, 11.96 is 94.5% of 12.65. This makes the discharge rate to be less than 6%. Actually about 11.88 is 100% discharged so you need to redo your math. Like I said before, a voltage reading of 11.96 indicates an 80% discharged battery. |
With a load and/or at lower temperature, the voltage is much less.
12.0 open circuit is a 25% charge but under load expect something more
like 8-9 volts at zero degrees F, with the complication that a battery
with less than 9-10 volts open circuit will tend to charge very slowly
at first.
#22
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"Mike" <mik (AT) localnet (DOT) com> wrote in message news:SfOPh.5849$B25.1882 (AT) news01 (DOT) roc.ny... "Jeff Strickland" <crwlr (AT) verizon (DOT) net> wrote in message news:szAPh.368$jZ3.275 (AT) trnddc06 (DOT) .. "Mike" <mik (AT) localnet (DOT) com> wrote in message news:ClwPh.5969$ya1.4904 (AT) news02 (DOT) roc.ny... "Greg" <greglc84 (AT) hotmail (DOT) com> wrote in message news _uPh.4647$aG1.3248 (AT) pd7urf3no (DOT) ..I read the rest of the replies, mostly argueing about resistence, anyway Mike I cleaned all connections on bat. solinoid, and alt. only one I didn't clean was one down at starter, and starter and bat cables are about a year old. Bill mentioned at some point bat. was disconnected while running, that didn't happen, but when I thought the bat. was dead the other day I used my battery charger which has a setting for 70 amps to start a vehicle, which I used and it arced when disconncting it. I replaced everything on engine when I put a rebuilt in 1 1/2 years ago, all but alt. Am I now ready for that? First start with a known good battery. A fully charged battery should read around 12.65 volts. The voltage reading you got when ckecking your battery, 11.96, indicates a battery that is 80% DISCHARGED. 80% discharged!? No, how about 20% discharged?. Actually, 11.96 is 94.5% of 12.65. This makes the discharge rate to be less than 6%. Actually about 11.88 is 100% discharged so you need to redo your math. Like I said before, a voltage reading of 11.96 indicates an 80% discharged battery. Sorry, I don't follow you. Please 'splain me it. I'm pretty sure my cars start easily with 11.88 vDC. It's not even close to being fully discharged. |
start as long as it is available at loads of 150 amp or so.
#23
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Jeff Strickland proclaimed: "Mike" <mik (AT) localnet (DOT) com> wrote in message news:SfOPh.5849$B25.1882 (AT) news01 (DOT) roc.ny... "Jeff Strickland" <crwlr (AT) verizon (DOT) net> wrote in message news:szAPh.368$jZ3.275 (AT) trnddc06 (DOT) .. "Mike" <mik (AT) localnet (DOT) com> wrote in message news:ClwPh.5969$ya1.4904 (AT) news02 (DOT) roc.ny... "Greg" <greglc84 (AT) hotmail (DOT) com> wrote in message news _uPh.4647$aG1.3248 (AT) pd7urf3no (DOT) ..I read the rest of the replies, mostly argueing about resistence, anyway Mike I cleaned all connections on bat. solinoid, and alt. only one I didn't clean was one down at starter, and starter and bat cables are about a year old. Bill mentioned at some point bat. was disconnected while running, that didn't happen, but when I thought the bat. was dead the other day I used my battery charger which has a setting for 70 amps to start a vehicle, which I used and it arced when disconncting it. I replaced everything on engine when I put a rebuilt in 1 1/2 years ago, all but alt. Am I now ready for that? First start with a known good battery. A fully charged battery should read around 12.65 volts. The voltage reading you got when ckecking your battery, 11.96, indicates a battery that is 80% DISCHARGED. 80% discharged!? No, how about 20% discharged?. Actually, 11.96 is 94.5% of 12.65. This makes the discharge rate to be less than 6%. Actually about 11.88 is 100% discharged so you need to redo your math. Like I said before, a voltage reading of 11.96 indicates an 80% discharged battery. Sorry, I don't follow you. Please 'splain me it. I'm pretty sure my cars start easily with 11.88 vDC. It's not even close to being fully discharged. Open circuit as opposed to starting load voltage. 9 volts is enough to start as long as it is available at loads of 150 amp or so. |
fully discharged battery. My logic says that such a charge would be almost
full as opposed to almost empty.
#24
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First start with a known good battery. A fully charged battery should read around 12.65 volts. The voltage reading you got when ckecking your battery, 11.96, indicates a battery that is 80% DISCHARGED. 80% discharged!? No, how about 20% discharged?. Actually, 11.96 is 94.5% of 12.65. This makes the discharge rate to be less than 6%. Actually about 11.88 is 100% discharged so you need to redo your math. Like I said before, a voltage reading of 11.96 indicates an 80% discharged battery. Sorry, I don't follow you. Please 'splain me it. I'm pretty sure my cars start easily with 11.88 vDC. It's not even close to being fully discharged. Open circuit as opposed to starting load voltage. 9 volts is enough to start as long as it is available at loads of 150 amp or so. I know that. I don't know why anybody would state that 11.88 volts is a fully discharged battery. My logic says that such a charge would be almost full as opposed to almost empty. |
you will get a start out of it. Your connections better be really clean,,,
When a battery reads 11.88 volts 'at rest', it has no more power or amps
left in it. The two are not linear. Volts is just how fast power can
come at you, you need something to push the volts. (more or less)
There is only about a 1 volt difference between a battery with all it's
cranking amps available and one with none left.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
#25
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"Lon" <lon.stowell (AT) comcast (DOT) net> wrote in message news:CZSdnbn6fuCMw43bnZ2dnUVZ_oninZ2d (AT) comcast (DOT) com... Jeff Strickland proclaimed: "Mike" <mik (AT) localnet (DOT) com> wrote in message news:SfOPh.5849$B25.1882 (AT) news01 (DOT) roc.ny... "Jeff Strickland" <crwlr (AT) verizon (DOT) net> wrote in message news:szAPh.368$jZ3.275 (AT) trnddc06 (DOT) .. "Mike" <mik (AT) localnet (DOT) com> wrote in message news:ClwPh.5969$ya1.4904 (AT) news02 (DOT) roc.ny... "Greg" <greglc84 (AT) hotmail (DOT) com> wrote in message news _uPh.4647$aG1.3248 (AT) pd7urf3no (DOT) ..I read the rest of the replies, mostly argueing about resistence, anyway Mike I cleaned all connections on bat. solinoid, and alt. only one I didn't clean was one down at starter, and starter and bat cables are about a year old. Bill mentioned at some point bat. was disconnected while running, that didn't happen, but when I thought the bat. was dead the other day I used my battery charger which has a setting for 70 amps to start a vehicle, which I used and it arced when disconncting it. I replaced everything on engine when I put a rebuilt in 1 1/2 years ago, all but alt. Am I now ready for that? First start with a known good battery. A fully charged battery should read around 12.65 volts. The voltage reading you got when ckecking your battery, 11.96, indicates a battery that is 80% DISCHARGED. 80% discharged!? No, how about 20% discharged?. Actually, 11.96 is 94.5% of 12.65. This makes the discharge rate to be less than 6%. Actually about 11.88 is 100% discharged so you need to redo your math. Like I said before, a voltage reading of 11.96 indicates an 80% discharged battery. Sorry, I don't follow you. Please 'splain me it. I'm pretty sure my cars start easily with 11.88 vDC. It's not even close to being fully discharged. Open circuit as opposed to starting load voltage. 9 volts is enough to start as long as it is available at loads of 150 amp or so. I know that. I don't know why anybody would state that 11.88 volts is a fully discharged battery. My logic says that such a charge would be almost full as opposed to almost empty. |
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