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Old 07-12-2021, 02:59 PM #16
Hans Moleman Hans Moleman is offline
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Old 07-12-2021, 06:42 PM #17
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Quote:
Originally Posted by vondy21 View Post
So how many of you with the AGMs have upped the charging voltage with the GM fuse? How many have simply done nothing but run stock with the AGM? I'm curious if it's really necessary.
My 4R has a dual Battery system. Primary battery is a Odyessey 34R and secondary is a Optima Marine deep cycle, which powers all none OEM accessories. I did not do the mod to the alternator.
I use a CTEC 7002 battery maintainer for both batteries. Albeit the 4R is not a DD. Its on a charger when not in use.
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Old 08-11-2021, 10:26 PM #18
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Originally Posted by Rack View Post
My 4R has a dual Battery system. Primary battery is a Odyessey 34R and secondary is a Optima Marine deep cycle, which powers all none OEM accessories. I did not do the mod to the alternator.
I use a CTEC 7002 battery maintainer for both batteries. Albeit the 4R is not a DD. Its on a charger when not in use.
Hey can you explain the CTEC a little bit ? I googled it but still not quite clear how it works.
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Old 08-12-2021, 12:43 PM #19
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OK I could retract that question, on further reading I gather it is a trickle charger.

Thanks !
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Old 08-13-2021, 09:04 AM #20
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Quote:
Originally Posted by curmudge1 View Post
I bought a DieHard Gold AGM Automotive Battery - Group Size EP-34R from Sears in October 2016... no diode mods, still working OK. (shh, when they overhear you bragging, they're going to fail just to annoy you, make you look bad).

I got some kind of discount then, it was $134. Looks like they're $220 now.
Advance Auto lists a DieHard Platinum AGM Group size 34 for $220, 3 year replacement. They don't seem to discount the DieHards.

Not sure who makes the DieHard these days.
I put the same AGM battery in my 15 Sienna and 11 4R a year ago with no mods. Took a 4 week vacation this summer and left the 4R on a charger. When I hooked it to my smart my smart charger, it ran the diag (always does) and announced it was fully charged before going into trickle mode. Point being, the 4R seems to be keeping it charged without modification.
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