Voltage experts!! Help!!!

[mazzasec 5,000+ posts]

Alright so I am starting to get very pissed about my voltage. Before I was running a sundown 3000d @.5 with 1 g34 under the hood and 2 g31 in the rear. stock alt. Volts dropped to 11.4 full tilt. Now I got a Mechman 250amp alt thinking my voltage problems would be solved. But no. I get out my DMM. Full tilt idle battery under the hood reads 12.5 but then I DMM at the amp and I read 11.8 I have literally tried EVERYTHING. Switched grounds, grounded ALL batteries to chassis then grounded to each other. Ran a run of ground from the front Neg to the rear Neg. That didnt help so then I ran an UNFUSED run from the positive up front to the positive in the rear. STILL having problems. So as of right now this is the equipment and it cant be right.

Sundown 3000d @.5

1 G34 under hood, 2 G31 in the rear. 250 mechman alt.

At idle ALL batteries read 14.4. At full tilt front reads 12.5 at idle and the amp reads 11.8 When I rev up to 2000rpm amp reads 12.1.

My question is WHAT IS THE **** PROBLEM!!!!!!!!!!!!

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[IDSkoT 5,000+ posts]

What size wire?

 

[mazzasec 5,000+ posts]

1/0 gauge throughout the WHOLE car. Everything is grounded actually everything is DOUBLE grounded.

 

[IDSkoT 5,000+ posts]

Check the voltage at your distro/fuse block.

 

[mazzasec 5,000+ posts]

Check the voltage at your distro/fuse block.

I am pretty sure that isnt the problem cause I straight wired everything no fuses and it still did the same thing.....

 

[bones22 5,000+ posts]

just 1 run of 1/0 to the rear?

 

[IDSkoT 5,000+ posts]

Sundowns have 0/1 in?!

O_O

:madprops:

 

[Andrizzle 10+ year member]

maybe its ur batteries.... sundowns are hungry perhaps?

 

[mazzasec 5,000+ posts]

That sundown cant be pulling that much more then 300 amps and with a 250 amp alt and 3 batteries. I feel I shouldnt have these problems.

 

[IDSkoT 5,000+ posts]

That's weird.

 

[JBGabriel 10+ year member]

That sundown cant be pulling that much more then 300 amps and with a 250 amp alt and 3 batteries. I feel I shouldnt have these problems.

Agreed your dropping way more than you should. I would look into the alt if you checked everything else.

 

[mazzasec 5,000+ posts]

Ya I dont think its the Alternator though. Cause at full tilt idle my front battery reads 12.5 which is reasonable. There is something that is causing it to drop a whole volt from my front battery to the amp. I cant figure out what it is.

 

[king ranch 5,000+ posts]

mine is the same way i am at full tilt at idle front battery is around 13 back battery is around 12.4-12.7 and the amp reads around 12.4-12

 

[davidt487 10+ year member]

how many runs of 0/1 from batt to amp?

 

[JBGabriel 10+ year member]

Ya I dont think its the Alternator though. Cause at full tilt idle my front battery reads 12.5 which is reasonable. There is something that is causing it to drop a whole volt from my front battery to the amp. I cant figure out what it is.

Honestly I dont think you should drop that low even in the front. IMO But I really dont know how much current that amp pulls at .5.