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tusseltussel
User
Jun 30, 2009, 8:31 AM
Post #1 of 4
(1904 views)
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hello, i have been having trouble with my truck for some time and i was thinking i had one just like it well a 78' and had similar problems where the battery had a bernt cell but when i load tested it, it tested fine, put a new one with 875cca(old one had 600)all my problems went away. so now i have similar problems with this one, hard to start when hot, rough runing when started and warmed up but if you take it on the road and than stop its running fine. makes me think it is not fully charged so it runs ruff than after you ride around a bit it has enuff charge to operate correctly. so i poped the caps off tha batt. and checked with a hygrometer and posative number 1 reads just at the top of the fair markjust before the red, and the rest are in the red on both pos and neg sides. i started it up and ran it awhile shut it down and got similar readings. next q, how full are those cells supposed to because they seem low, and after driveing for a little bit,not too far you can here that baby bubbleing, last time i herd that it was a gm with the delco battery and it was smokin an awful smell out the vents, was time for a new one...... 1 more thing, i only have a ground from the battery to the block and the block to the fire wall, shouldn't it be battery to frame, frame to block, block to fire wall, and will that cause a problem
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 30, 2009, 9:32 AM
Post #2 of 4
(1899 views)
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Re: 79' f350...351m
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The first thing you need to do is have your battery tested. They have new types of testers now that can read the CCA of the battery. As far as your grounds are concerned, yes everything should be grounded and somehow connected to the negative battery terminal. It will never hurt to have too many grounds so if you have any question, just add another cable either directly from the battery to the frame or from the engine to the frame.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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tusseltussel
User
Jul 2, 2009, 7:30 AM
Post #3 of 4
(1887 views)
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Re: 79' f350...351m
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ok so i ended up needing a new battery parts man didn't have one as big as the one that came out of it so he gives me one that he says will work. it has 525cca, i added a ground from the block to the frame so now everything is grounded, im having a problem with it cranking slow when cold and when hot, if i shut er down and start er up it cranks strong but if i shut er down and wait 5 minuts it cranks real slow like its not even gonna turn the engine, it does fire up just seems to struggle. could this be that the battery is too small, or maybe the starter is drawing too much power???? i explained to the parts guy how my old truck would do this and when i put a larger 825cca battery in it all my problems went away, no more hard start, slow cranking or sparkies breaking up. in adittion i pulled the cap and unscrewwed the modual wire hold down\ground, cleaned it up put it back together and checked the timing, all checks out. would it pay to clean up around where the distributor makes contact with the manifold, i imagine it needs a good ground their too. i also plan to go out now and clean up the ground that goes from the manifold to the fire wall. my brother used to tell me all the time growing up with variouse cars in the driveway to be sure all grounds are clean brite and tight any ideas were to go next ........EDIT... i wanted to add that it is not running too hot its running right around or in normal, sometimes it will get up to ma range with carry over after shutting it down but not really that often only if i been on the highway for awhile
(This post was edited by tusseltussel on Jul 2, 2009, 7:37 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 2, 2009, 7:53 AM
Post #4 of 4
(1881 views)
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Re: 79' f350...351m
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You could have a bit of both things here. The battery is a bit small and your starter could be drawing high current. Too much demand coupled with low supply leaves you with a shortage of power.
They can test the current draw of the starter easily enough. Anything over 250 amps would be excessive. Under 200 would be preferred.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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