Voltage problem?

[khinds94 17]

I have a xp2000 in the back and when I bought it I put it in my car and it charged at 13.1 or 14.4 @ 2k rpm. A few days ago when I turned my car on my voltage was at 13.1 like it normally charges at but when I revved the engine it wouldnt charge to 14.4, it slowly then dropped by .1 around per day until I unhooked it because it got to around 12.2.

 

So I checked my connections and grounds and saw no problems. I then looked at the front battery and it was charging at 13.1 and 14.4, but the xp2000 in the back does not charge when its hooked up.

 

So I hooked it up to a charger overnight and it read about 14.4 in the morning and unhooked it, I then went to work and came back and it was back at 13.

 

I put it back in the car to see if it would charge by the alternator to 13.1/14.4 but it sat at 13.5 and continues to drop by .1 everyday.

 

I dont understand why the alt is not charging it. Am I suppose to charge the bat higher than 14.4 initially?

[SacredTanakh 67]

As far as your alternator charging the front and not the back, there must of been a loss in connection between them. Otherwise they would even out between the both of them.

[khinds94 17]

As far as your alternator charging the front and not the back, there must of been a loss in connection between them. Otherwise they would even out between the both of them.

I thought the same thing so I disconnected the battery, brought it to the front. Hooked up jumper cables from the front bat to the xp. And still did not charge. When I put it on the charger it charges up. But it doesn't hold a charge in the car.

[garychurch84 127]

Weird

go have the battery tested

[khinds94 17]

I know. There must be something I'm doing wrong. This battery is a week old.

[khinds94 17]

Uhhh yea it was a blown fuse from front bat to rear...

 

Probably should have checked that first.

 

Charging at 14.4-14.5 now

[nadcicle 77]

Uhhh yea it was a blown fuse from front bat to rear...

 

Probably should have checked that first.

 

Charging at 14.4-14.5 now

 

Would have suggested to check that except you said that you brought the battery up front and hooked it to the front and got the same results.

[khinds94 17]

Uhhh yea it was a blown fuse from front bat to rear...

Probably should have checked that first.

Charging at 14.4-14.5 now

Would have suggested to check that except you said that you brought the battery up front and hooked it to the front and got the same results.

Yea I think the reason why I didn't notice is because my idle voltage is 13.1 and that's what the battery was resting at. And I couldnt try charging it because I was up front and couldn't put my foot on the gas lmfao. Just thought it wasn't charging.

[EricCameron 0]

Whats going on man.  are you mixing your stock batt with a XP2000? if so, i think i have a solution for you lol.

[khinds94 17]

Lol everything's working now...and I probably should get an agm up front lol. Voltage doesn't drop below 13.3 though full tilt.

[swift 501]

I would be more concerned about why the fuse was blown.

[Fi 4 life 0]

Same here swift.

[khinds94 17]

250 amp fuse. Do you think I need another run of pos from front batt to back?

[j-roadtatts 1,129]

The fuse should be matched to the wire rating or just below it. What size wire are you running? That would answer if you need another run. I believe 1/0ga is good to 200 amps.

[khinds94 17]

Your right it is 1/0 but it came with 250 amp fuses?