Question about 1991 Mercedes-Benz 300 Diesel

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1995 300 Diesel

Yesm I actually connected the negative terminal to the positive terminal on the battery and the positive to the ground... part of plastic around postive terminal melted,,, car starts up fine and light work, but,,,, all the dash light are on,,, brake, battery, etc... also , tack does not work, gas amber light on all the time... is there one fuse or solenoid that I can change to fix?

I have done own work all these years and have never reversed terminals? ahhhhhhhh

Thanks

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Replace battery ..melted anode will leak noxious gases and KILL you.....i am inclined to think that a bad or melted ground line is the culprit to the weird dash light situation look from battery terms to main ground strap and clean and tighten..also dash area ...(headlights have their own connections separate from other wiring systems in car)

Posted on Nov 10, 2008

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On the starter For a Hyundai accent which terminal should I connect the red battery cable


Good question, because connecting it the wrong way can damage the starter, the battery, or both! The red cable connector clamps to the positive terminal, and the black cable clamps to the negative terminal. On a new battery, it is often easy to tell which is positive by their markings (+) = positive and (-) is negative. In reality, the markings may be difficult to see. The red or positive post is larger in diameter. The black or negative post is a ground so you can follow it from the post to somewhere solid on the metal frame of the car.

Note the cross on the top of the battery post.

According to In.answers.yahoo.com :

"...the battery case will have a + near the positive or a - near the negative terminal. If these don't exist then the positive post will have a larger diameter post than the ground post, this is if the battery is a top post.



If it's a side terminal battery which GM cars used for a while it should be marked on the top of the battery or on the front with its respective sign. Otherwise you can look at the cable that's connected to it which are usually color coded. Red is positive and black is negative."

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Full and oil gauge work on and off I think its bad grounds where would the ground wires be


Essentially, a "ground" is an electrical connection to a common return in circuit. In automotive terms a ground is a connection to the body or other metal surface of the vehicle. The body in the RX-7 is connected to the negative terminal of the battery. Thus any connection to the body of the car is a connection to the negative terminal of the battery. Electricity flows from the positive of the battery, through the circuit to do some work, then back through the body to the battery (technically electrons actually flow from negative to positive but that is beyond the scope of this article). This is a "negative ground" system which is by far the most popular automotive ground scheme used in the automotive world. "Positive ground" systems were popular in the beginning with all car manufacturers and continued on in British vehicles until recently.

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1 Answer

How to replace a starter??


Ford Excursion, Expedition, Lincoln Navigator 2000-2005
Starter

Print


Removal & Installation

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.

    Negative battery cable
  2. Raise and safely support the vehicle.
  3. Remove or disconnect the following:
    NOTE To disconnect the hard-shell connector from the solenoid S terminal, grasp the plastic shell and pull off; do not pull on the wire. Pull straight off to prevent damage to the connector and S terminal.


    Starter terminal cover Terminal nut and separate the battery starter cable from the starter motor Solenoid S terminal connector, if equipped with a starter mounted solenoid
  4. Remove or disconnect the following:

    Starter motor retaining bolts Starter motor from the vehicle

To install:
  1. Install or connect the following:

    Starter motor and retaining bolts. Tighten the bolts to 15-20 ft. lbs. (20-27 Nm). Bttery starter cable and a terminal nut to the starter motor. Tighten the terminal nuts to 79 inch lbs. (9 Nm). Slenoid S terminal connector, if equipped with a starter mounted solenoid Sarter solenoid safety cap, if equipped
  2. Lower the vehicle.
  3. Remove or disconnect the following:

    Ngative battery cable
  4. Start the engine several times to check starter motor operation.

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove or disconnect the following:

    Negative battery cable
  3. Raise the front of the truck and install jackstands beneath the frame. Firmly apply the parking brake and place blocks in back of the rear wheels.
  4. Remove or disconnect the following:

    Wiring from the starter motor terminals Starter motor retaining bolts, loosen Starter retaining bolts while supporting the starter motor Starter from the vehicle

To install:
  1. The installation is the reverse of removal. Tighten the starter retaining bolts to 15-20 ft. lbs. (20-27 Nm)

4.6L, 5.4L & 6.8L Engines
  1. Before servicing the vehicle, refer to the precautions section.
  2. Disconnect the negative battery cable.
  3. Raise and safely support the vehicle.
  4. Remove or disconnect the following:
    NOTE To disconnect the hard-shell connector from the solenoid S terminal, grasp the plastic shell and pull off; do not pull on the wire. Pull straight off to prevent damage to the connector and S terminal.


    Starter terminal cover Terminal nut and separate the battery starter cable from the starter motor Solenoid S terminal connector, if equipped with a starter mounted solenoid
  5. Remove or disconnect the following:

    Starter motor retaining bolts Starter motor from the vehicle

To install:
  1. Install or connect the following:

    Starter motor and retaining bolts. Tighten the bolts to 15-20 ft. lbs. (20-27 Nm). Battery starter cable and a terminal nut to the starter motor. Tighten the terminal nuts to 79 inch lbs. (9 Nm). Solenoid S terminal connector, if equipped with a starter mounted solenoid Starter solenoid safety cap, if equipped
  2. Lower the vehicle.
  3. Connect the negative battery cable.
  4. Start the engine several times to check starter motor operation.

6.0L Diesel Engine
  1. Before servicing the vehicle, refer to the precautions section.
  2. Disconnect the battery ground cable.
  3. Remove starter solenoid protective cap.
  4. Disconnect the starter motor electrical connections.
  5. Remove the bolts and the starter.

To install:
  1. Installation is the reverse of the removal procedure. Tighten the starter bolts to 18 ft. lbs. (25 Nm)

7.3L Engine
  1. Before servicing the vehicle, refer to the precautions section.
  2. Remove or disconnect the following:

    Negative battery cable
  3. Raise the front of the truck and install jackstands beneath the frame. Firmly apply the parking brake and place blocks in back of the rear wheels.
  4. Remove or disconnect the following:

    Wiring from the starter motor terminals Starter motor retaining bolts, loosen Starter retaining bolts while supporting the starter motor Starter from the vehicle

To install:
  1. The installation is the reverse of removal. Tighten the starter retaining bolts to 15-20 ft. lbs. (20-27 Nm)


Testing & Troubleshooting

Feed Circuit Test

  1. Make sure the battery is fully charged.
  2. Disconnect the Inertia Fuel Shutoff (IFS) switch.
  3. Connect a remote starter switch between the starter solenoid S-terminal and the battery positive (+) terminal.
  4. Connect the Rotunda 73 Digital Multimeter positive lead to the battery positive (+) post. Connect negative lead to the starter solenoid M-terminal.

    0996b43f80204e8b.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Motor feed circuit-S-terminal (1), remote starter switch (2), battery (3), Rotunda 73 digital multimeter (4), B-terminal (5), M-terminal (6)

  5. Engage the remote starter switch. Read and record the voltage. The voltage reading should be 0.5 volt or less.
  6. If the voltage reading is 0.5 volt or less, go to the Motor Ground Circuit Component Test.
  7. If the voltage reading is greater than 0.5 volt, indicating excessive resistance, move the Rotunda 73 Digital Multimeter negative lead to the starter solenoid B-terminal and repeat the test. If the voltage reading at the B-terminal is lower than 0.5 volt, the concern is either in the connections at the starter solenoid or in the solenoid contacts.
  8. Remove the cables from solenoid B-, S- and M-terminals. Clean the cables and connections and reinstall the cables to the correct terminals. Repeat Steps 3 through 6. If the voltage drop reading is still greater than 0.5 volt when checked at the M-terminal or less than 0.5 volt when checked at the B-terminal, the concern is in the solenoid contacts. Install a new starter motor.
  9. If the voltage reading taken at the solenoid B-terminal is still greater than 0.5 volt after cleaning the cables and connections at the solenoid, the concern is either in the positive (+) battery cable connection or in the positive battery cable itself.
  10. By moving the Rotunda 73 Digital Multimeter negative lead toward the battery and checking each mechanical connection point, the excessive voltage drop can be located. When the high reading disappears, the last mechanical point that was checked is the concern. Repair or install a new connection as required.

Ground Circuit Test
A slow cranking condition can be caused by resistance in the ground or return portion of the cranking circuit. Check the voltage drop in the ground circuit as follows:
  1. Disconnect the inertia fuel shutoff switch.
  2. Connect a remote starter switch between the starter solenoid S-terminal and the battery positive (+) terminal.
  3. Connect the Rotunda 73 Digital Multimeter positive lead to the starter motor housing (the connection must be clean and free of rust or grease). Connect the negative lead to the negative (-) battery terminal.

    0996b43f80204e8c.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Motor ground circuit-Rotunda 73 digital multimeter (1), battery (2), S-terminal (3), M-terminal (4), B-terminal (5), remote starter switch (6)

  4. Engage the remote starter switch and crank the engine. Read and record the voltage reading. The reading should be 0.2 volt or less.
  5. If the voltage drop is more than 0.2 volt, clean the negative cable connections at the battery and body connections, and retest.
  6. If the voltage drop is greater than 0.2 volt, determine which way the current is flowing in the cable.
  7. Connect the Rotunda 73 Digital Multimeter positive lead to the end of the cable nearest battery positive.
  8. Connect the multimeter negative lead to the terminal at the other end of the cable.
  9. Crank the engine and observe the voltage reading. The voltage reading should be 0.2 volt or lower. If the voltage drop is too high, clean the terminal ends. Retest, and if still high, install a new cable. If the voltage reading is less than 0.2 volt and the engine still cranks slowly, install a new starter motor.

Voltage Drop Test

WARNING When servicing the starter motor or performing other underhood work in the vicinity of the starter motor, be aware that the heavy gauge battery input lead at the starter solenoid is "electrically hot" at all times.

WARNING A protective cap or boot is provided over the battery input terminal on all vehicle lines and must be installed after servicing. Be sure to disconnect the battery ground cable before servicing the starter motor.
Always make the Rotunda 73 Digital Multimeter connections at the component terminal rather than at the wiring end connector. Making a connection at the wiring end connector could result in false readings because the meter will not pick up a high resistance between the wiring connector and the component.

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How do I remove the alternator on my 1998 Dodge 1500 4wd?


WARNING: DISCONNECT NEGATIVE CABLE FROM BATTERY BEFORE REMOVING BATTERY OUTPUT WIRE (B+ WIRE) FROM GENERATOR. FAILURE TO DO SO CAN RESULT IN INJURY OR DAMAGE TO ELECTRICAL SYSTEM .

  1. Disconnect negative battery cable at battery. Diesel Engines: Disconnect both negative battery cables at both batteries.
  2. Remove generator drive belt.
  3. dak408_183.gif

  1. Remove generator pivot and mounting bolts/nut. The diesel engine uses a bolt at top mounting and a bolt/nut at lower mounting. Position generator for access to wire connectors.
dak408_184.gif
  1. Remove nuts from harness holddown, battery terminal, ground terminal and 2 field terminals. Remove wire connectors. A typical generator wiring harness is shown in. Wiring harness routing as shown may be slightly different depending on vehicle model and/or engine.
  2. Remove generator from vehicle.
INSTALLATION
  1. Position generator to engine and install wiring to rear of generator. Tighten all wiring fasteners as follows:
    • Battery terminal nut-8.5 N.m (75 in. lbs.)
    • Ground terminal nut-8.5 N.m (75 in.lbs.)
    • Harness holddown nut-8.5 N.m (75 in. lbs.)
    • Field terminal nuts-2.8 N.m (25 in. lbs.)
  1. Install generator mounting fasteners and tighten as follows:
    • Generator mounting bolt-All gas powered engines-41 N.m (30 ft. lbs.)
    • Generator pivot bolt/nut-All gas powered engines-41 N.m (30 ft. lbs.)
    • Generator mounting bolt-Diesel powered engines-54 N.m (40 ft. lbs.)
    • Generator pivot bolt/nut-Diesel powered engines-54 N.m (40 ft. lbs.)

CAUTION :
  • Never force a belt over a pulley rim using a screwdriver. The synthetic fiber of the belt can be damaged.
  • When installing a serpentine accessory drive belt, the belt MUST be routed correctly. The water pump will be rotating in the wrong direction if the belt is installed incorrectly, causing the engine to overheat.
  1. Install generator drive belt.
  2. Install negative battery cable(s) to battery(s).

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Should the battery charger be connected directly


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Voltage drop test


First, check battery post to cable connection: positive meter lead on battery positive post, negaitve lead on battery's positive cable clamp. Crank the engine and note the reading. A good connection should have zero voltage drop. Second, check the positive cable: positve meter lead on positive battery clamp, negative lead on starter terminal connector. A good cable will show a voltage drop of .2 volts or less while cranking. Third, check the starter connection: positive meter lead on positive battery terminal on the solenoid, negative meter lead on actual starter stud. A good connection will have a voltage drop of near zero volts. Now to check the negative side of the circuit. Total drop on the ground side should be .3 volts or less and can be checked by placing positive meter lead on starter housing and negative meter lead on battery ground post. Take your reading while cranking the engine, and be sure your connection at the starter is solid and clean. If total voltage drop on this side of the circuit is excessive, complete testing at all connections in the same fashion as the positive side of the circuit. Check the following: between battery post and clamp (zero voltage drop), cable end at battery to cable end at engine. (.2 volts or less), cable end at engine to engine itself (near zero voltage drop), and finally between starter housing and engine block (.1 volts or less).

To read the entire procedure for all automotive systems read this artile:
http://www.engine-light-help.com/voltage-drop.html

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