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Old 12-02-2009, 11:09 AM   #1 (permalink)
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First gen dual batteries?

Has anyone put a second battery in their first gen to help with cold starting? I wired in a second one a couple of years ago, but they seem to be giving me more trouble than its worth. Batteries getting hot, grounding problems, lights dimming and brightening with the alternator. Has anyone else had these problems, or does anyone have any ideas.
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Old 12-02-2009, 11:44 AM   #2 (permalink)
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the lights dimming is probably the grid heaters cycling while its cold. i have a buddy at nashville auto diesel college and they just studied electricity. the instructor told him you can hook up a battery in a parallel circuit and double the cranking amps but stay at 12v. if you hook them up in series it doubles volts and keeps same cranking amps. parallel is positive to positive and series is positive to negative. i was thanking about trying it myself. whta kind of problems were you having ?
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Old 12-02-2009, 02:10 PM   #3 (permalink)
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sounds like a voltage regulator issue...

fill out your signature so we know what truck you have... User CP > edit signature
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Old 12-02-2009, 02:13 PM   #4 (permalink)
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I would just rather use a Quality oversize single
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Old 12-02-2009, 05:15 PM   #5 (permalink)
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Mine had a single battery as stock, but I've got a heavy truck battery with steel posts (takes lead post adaptors) and something like 1300 CCA. Never any doubt about starting anyhow with this engine, but never know when a REAL cold start may be necessary. ...
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Old 12-02-2009, 07:34 PM   #6 (permalink)
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The lights dim while its running at an idle, and every once in a while my blinker will make my dash lights and radio flicker.
denman, what make is the heavy truck battery you use?
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Old 12-02-2009, 11:53 PM   #7 (permalink)
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I got a good quality group 31, no problems starting even after running a camper for the better part of the week, including running the electric boat motor.

But...you should figure out any possible wiring issues before blaming the batteries 100%.
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Old 12-03-2009, 12:04 AM   #8 (permalink)
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Quote:
Originally Posted by GeneralC View Post
the lights dimming is probably the grid heaters cycling while its cold. i have a buddy at nashville auto diesel college and they just studied electricity. the instructor told him you can hook up a battery in a parallel circuit and double the cranking amps but stay at 12v. if you hook them up in series it doubles volts and keeps same cranking amps. parallel is positive to positive and series is positive to negative. i was thanking about trying it myself. whta kind of problems were you having ?
Are you sure about that? To the best of my knowledge, if you hook them in parellel (pos to pos), that would make it a 24v system?
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Old 12-03-2009, 12:07 AM   #9 (permalink)
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click ->Connecting Batteries in Series or Parallel
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Old 12-03-2009, 12:11 AM   #10 (permalink)
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thats what it says in my buddies handbook at school to about connecting batteries. it was purty neat actually reading all about it. but yes im positive that connecting parallel keeps 12voltage and doubles cranking amps
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Last edited by GeneralC; 12-03-2009 at 12:14 AM.
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Old 12-03-2009, 12:17 AM   #11 (permalink)
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You want your batteries in parallel to double amperage with the same voltage, series doubles the voltage with the same amperage.
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Old 12-03-2009, 12:23 AM   #12 (permalink)
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2nd on that

Quote:
Originally Posted by Beefstick View Post
You want your batteries in parallel to double amperage with the same voltage, series doubles the voltage with the same amperage.
2nd on that, parallel doubles amps, series doubles volts.
I got 4 batteries setup in parallel on my 12 volt solar system.

Check your grounds and other connections, having 2 batteries shouldn't case any more problems then having one.
Have you replaced altenator/volt regulator?
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