2nd batt won't stay charged

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ragoal12

Copper - Posts: 135

Joined: July 23, 2005

Location: United States

Posted: October 17, 2005 at 4:55 PM / IP Logged

so my problem is that my second battery will not stay charged... im running an optima red top under the hood and i have a stinger 800 batt. in the back... i have grounds on my front battery to the motor, chassy, and body.. the back battery is grounded just to the body.. all the wiring is 4 guage and the alternator lead is also updated to 4 guage... r my grounds not good enough??? or do i have a bad battery?? any help is greatly appreciated guys..

S.O.B custsoms.. South Omaha, Nebraska

Em12986

Copper - Posts: 55

Joined: August 09, 2005

Location: United States

Posted: October 17, 2005 at 5:03 PM / IP Logged

Do you have power wire from the front to the back.

ragoal12

Copper - Posts: 135

Joined: July 23, 2005

Location: United States

Posted: October 17, 2005 at 5:27 PM / IP Logged

EM12986 wrote:

Do you have power wire from the front to the back.

yes its 4 guage wire... kinda hard to power it without wiring...

S.O.B custsoms.. South Omaha, Nebraska

KarTuneMan

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Posted: October 17, 2005 at 5:28 PM / IP Logged

How do you know it's not staying charged? Is it isolated from the front battery?

If I were to guess....the battery is T.U. But I'm not a guessin man..... How are the 2 (batteries) connected to the alternator?

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: October 17, 2005 at 5:28 PM / IP Logged

I assume you have the second battery connected in parallel with the front battery? Could be your alternator simply does not have the capacity to charge them both. A second battery is not a substitute for a HO alternator.

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ragoal12

Copper - Posts: 135

Joined: July 23, 2005

Location: United States

Posted: October 17, 2005 at 5:40 PM / IP Logged

KarTuneMan wrote:

How do you know it's not staying charged? Is it isolated from the front battery?

If I were to guess....the battery is T.U.

the 2nd battery is connected in parralel to the front baterry.. it is isolated by a stinger 200 amp relay...

what is T.U.??? never heard that before...

i know the 2nd battery is not a replacement for an ho alternator.. im looking into getting one of those here very shortly... i was guessing that not having an ho alternator was my problem but i wanted to check with some people who have a little more expierence then me with this stuff.. thanx guys

S.O.B custsoms.. South Omaha, Nebraska

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: October 17, 2005 at 5:41 PM / IP Logged

ragoal12 wrote:

it is isolated by a stinger 200 amp relay...

what is T.U.??? never heard that before...

If it's isolated, how is it being recharged?

TU = "tits up." Dead.

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ragoal12

Copper - Posts: 135

Joined: July 23, 2005

Location: United States

Posted: October 17, 2005 at 5:59 PM / IP Logged

its isolated with a stinger sr200.. so its still being charged according to there website as follows:

First, no two batteries are exactly alike. Because of this, they will slowly discharge each other when connected together.

Installation of the SR200 will allow simultaneous charging, but will separate the batteries while the vehicle is not running.

Secondly, if there should be a battery failure while connected to the bank no discharge of the good batteries will take place.

This is because they will only be connected while the vehicle is charging (running).

i have my batteries hooked up as diagramed on there website.. if this is wrong please let me know.. or my alternator my be TU is what im thinking...

S.O.B custsoms.. South Omaha, Nebraska

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: October 17, 2005 at 8:10 PM / IP Logged

OK, if you have it hooked up correctly so that the two batteries are connected together only when the car is running, then if the second battery is not being charged it's because your alternator cannot handle the load. If it charges up OK but then it discharges when the car is off, then you have a short in the second battery system somewhere. Where are your amps connected: which side of the isolator are they powered from?

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haemphyst

Platinum - Posts: 5,054

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: October 18, 2005 at 9:02 AM / IP Logged

Read this thread.

I ranted a little bit in there, but the information is still valid. Replace both batteries right now, with IDENTICAL batteries, and my money says you will not likely have any more problems.

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

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