bouncing voltage

[MustangShane]

I have a problem with the voltage bouncing. I have a new alternator and have cleaned the all the terminals down to the starter. Now I think the battery has a bad cell. But I wasn't sure if there might be another problem I might not have thought of.

 

[Arnie897]

Do you have any larger stereo's hooked up? Mine bouces from the bass...

 

[Opera House]

Run a new wire from the engine block to the car frame. The engine ground and battery ground can be off by a volt if the factory ground straps co bad. Engine is basically isolated from body except for the bearings.

 

[MustangShane]

You know Opera you are probably right. The only stereo feature I have is a aftermarket radio, and it doesn't bounce with the bass. So thats probably not the culpret. But I'll reground it and see.

 

[MustangShane]

The motor that is and thanks.

 

[blue_97_v8]

Mine drop's some with my heater on full and all my light's on.It will drop at stop light's.How can i fix that?(i have cleaned everything 2 times over)

 

[Alec]

Originally posted by blue_97_v8
mine drop's some with my heater on full and all my light's on..it will crop at stop light's..how can i fix that?(i have cleaned everything 2 times over)

larger alternator or better grounds.

 

[blue_97_v8]

From what i have heard is that larger alternator make less power at idle is this true? I need kore power at idle at not when i moving. That and my stock motorcraft battery's getting old. the ground's are clean i have cleaned all of them.

 

[MustangShane]

Yeah I'd agree with Alec on this one. Your pulling more juice than your alt. can put out. You know something I was at the junkyard and saw a pretty decent looking "x" and looked under the hood. The whole fuse box was completely melted. I had never seen that before. Kind of interesting. Anyone else see/have this happen to them.

 

[MustangShane]

So add a second battery then, with an automatic switch. That should be all you need.

 

[blue_97_v8]

uh no the truck should be able to keep up. when it was new it was fine. i should be able to get it back to that. when it was new the voltage dident move at all nomatter what. now it does somthing's wrong(im sure it's the 7 year old battery)

 

[Alec]

Then try changing the battery and see what happens!

 

[blue_97_v8]

the battery hold's a charge fine. it has a good charge it's just old i think. i will get a optima when this one dies