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Classic/Antique Car Repair/electrical problem 1950 dodge b2b


I accidentally connected the 6v battery backwards. the truck started then, but now there is nothing. no lights, turn signals, it will not turn over. Have i killed this truck?

No you have not killed the truck. But there is a procedure that should bring it back to life. First we need to get the battery charged to the correct polarity. To do this completely discharge the battery. Then connect a charger to the battery is the proper polarity. Do the charge while the battery cable are disconnected from the truck. Then turn off all the accessories and the ignition key. Connect the positive cable, thus one now should be the one connected to the ground, the frame or the engine block.  net disconnect the B terminal from the voltage regulator. Then install the other battery cable. You should now have headlights. If not check the wiring and then have the battery tested, it might be fried. If the battery is ok now flash the wire that was connected to the B terminal to the B terminal (flash means momentary contact). If there is a spark the voltage regulator points are shorted and a new voltage regulator is in order. If this is the case I would remove the generator and make sure that it has not been damaged. Once the new regulator and the generator check out reconnect the B terminal, there should be no spark. Net disconnect the F wire and momentarily touch it to the B terminal. This will polarize the system. The truck should start run and charge.

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Brad Sears


All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.


Automotive tech instructor. Syndicated auto columnist 1970's though the early 1990's. Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's TV Show "Last Chance Garage" 1980's PBS-TV syndicated. Auto instructor for the following companies: Fram Autolyte Holly Carter AMF Ford Motor University Of Conn Blue Hills Technical School Sugar River Technical Center Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.

Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.

More than I care to remember. Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.

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Moto Award winner. And much more.

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