Posted by Hobo,NC on May 27, 2017 at 05:53:56 from (75.136.231.157):
In Reply to: Slow Crank posted by showcrop on May 26, 2017 at 16:38:08:
A short quick test.
One other thang to take into consideration is how the voltage jumps back to a fully charged state of 12.6
A short load test are just hitting the starter for 5 seconds dose the voltage go back to the recorded voltage before this test. If not you have a weak battery.
We don't get questions when the starting/charging system is working as it should. When you resolve the issue with a volt meter test it and report you findings. Test every vehicle you have write it down this is the known good facts to base your test on when its working good. Tractor, car are lawn mower with a year old battery your test should test the same.
When you take your bat back for a test watch and ask does he load the bat to haft its rated CCA for 15 sec. Did the battery voltage fall below 9.6V. His fancy tester can not do'dat in reality only in theory but his carbon pile tester should be able to are its not up to snuff for the job and only eye candy.
Its been reported HP has a 500 amp carbon pile tester for $50 that's a deal and the tool needed to preform a true load test.
Hydrometer testes are useless if the voltage is 12.6 after a short load test no need to use a hydrometer if its 11.6 after a short load test no need to use a hydrometer. I see no need for it other than to waist my time proving what I already know.
Another neat test is to remove the positive cable at the starter clamp that lead to the positive lead of a carbon pile tester and clamp the negative lead to the starter housing body. Load the system to 200 amps and record the voltage at the battery. If is normal the battery and connections are good. Normal would be 10.5V are higher for a healthy system depending on the CCA of the battery. With a healthy 750 CCA battery I would not expect it to drop below 11.5V...
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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