Alt possibly discharging?

[survivordude]

when the car idles it discharges per the gauge...when the rpm's are kept up its in the positive side...soooooo...guess I need to go have it checked or is this normal with the MOPARS?this is my first one buy the way...thanks in advance

[ShelbyDogg]

Yup, Mopar alternators don't charge at idle.  It's hell to tune a fuel injection setup when my voltage drops at idle and is worse when my H4 headlights are on.  I even run the later model 7355 altenator out of a 3/4 ton 80s model Dodge van and have the same problem.  The only way to fix this is to run the newer alternator like the Powermaster that Mancini sells. It is the later model GM style. The only reason I don't run one them is because of the price.

[survivordude]

Problem Im having is the rear running lights get really dim at idle,all other lights are ok,then when the rpm's come up they get nrighter and stay that way till it goes back tom idle...any clue?thanks in advance

[72cudamaan]

Problem Im having is the rear running lights get really dim at idle,all other lights are ok,then when the rpm's come up they get nrighter and stay that way till it goes back tom idle...any clue?thanks in advance

Possibly corrosion in the wiring or connectors creating high resistance.

[ShelbyDogg]

Possibly corrosion in the wiring or connectors creating high resistance.

Yes, check your connections. All my running lights only draw a little over 3 amps. That is over 17 bulbs in my 70 and 71 challengers.   If you have the alternator problem, you'll see the headlights dim at idle and you ammeter will be on the negative side.

The alternator I referenced from Mancini is here:
http://chucker54.stores.yahoo.net/postal.html

It says "excellent output at idle"