Odd problem with dummy lights in the cabin, (break and Battery)

[SupraMario]

Ok, so here it is.
As you all know The car is an 87 NA with a 2jzgte in it.

Now the problem is, when any of this happens: driving over a bump, breaking, accelerating, and highway speed engine slow downs(letting out on the gas and not using the breaks), My battery and parking break dummy lights will come on.

They do go off after about 15-45 seconds, sometimes sooner.

I've checked the fuse and its fine...what could be causing these 2 lights, which have nothing to do with each other come on at exactly the same time?

I'm guess its a short somewhere but, It didn't do this before with the NA in it...so??? Help.

 

[Poodles]

Usually it's those two lights and I think the check engine light that come on.

It means there is something wrong with the alternator...

 

[lagged]

alternator. check all leads going to the alternator for shorts or melted wires, if the wiring checks out then its time to replace the alternator.

 

[SupraMario]

Will do!
Thanks guys.

 

[91supran/a]

mine was doing that and about a week after it started my alt caught on fire on the road wasent good! burnt the wires from the alt all the way to the fuse box had to make my own to replace it. sucked! so check it before it happens to you. i got a napy rebuilt one with a lifetime warranty for 140

 

[SupraMario]

^^ Yea I don't plan on driving it until this is fixed.