Lights dimming and brightening on 2000 Chevy Venture

with lights on and when you engage starter, do lights dim?

Most likely the lead to the reverse lights has been worn through and is grounded out.

Remove both of your tail lights, Locate the wire for your reverse light and see if you can track it back very far to see if you can see the wire worn through anywhere. There is also a possibility that it could be worn and/or shorting near your reverse sensor switch (near your automatic transmission shifter stick)

also make sure your reverse lights are good and not filled with water or anything else either.

you need a new altinator if ur head lights dim and u are loosing power!!

You have a light sensor that automatically turns on your lights when it is dark enough. This is not your daytime running lights. It also turns on the dash & tail lights. This is why they do not get brighter when you turn the switch on, they are already on. If they do not seem to be bright enough, you may need to adjust the headlight aim.

distributor is advanced

If voltage regulator is good, then the dimmer switch is probably bad.

The circuit boards are a very common problem on these vans, moisture gets in them and creates a bad connection, check if you have power in the rear light socket and go from there, you often need to replace the circuit board in the rear light.

Have your charging system checked. I had a similar problem with a chrysler van - the lights would brighten and then dim periodically. it turned out to be the battery.

I have over 300k miles on my 2000 Venture. When the lights start flickering at low RPM's, the alternator or battery might be going bad. I would have it tested (for free) at the local AutoZone or Napa. The alternator SHOULD last 80-150,000+ miles. Its a real pain to change out on the Venture vans.

Sometimes I wonder if the van just doesn't create enough juice to run all of the accessories since even when batery and alternator are new they flicker once in a while when a component turns on.

I get zapped year round by my cars, even in high humidity. It is not harmful, but be careful at gas stations!

check to see if all doors are shut tight,the same thing was happening to me,and it was the very back door that was the problem