Starting question 73 1.7 |
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Starting question 73 1.7 |
rosenfe |
Jun 7 2024, 03:17 PM
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#1
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Senior Member Group: Members Posts: 564 Joined: 14-October 13 From: northern california Member No.: 16,512 Region Association: None |
When I turn key I get intermittent response from starter. Sometimes nothing, other times barley cranks. Rebuilt starter from bruce. New battery jumping posts with key on or off only spins starter motor. Bad starter?
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Superhawk996 |
Jun 8 2024, 12:28 PM
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#2
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914 Guru Group: Members Posts: 6,492 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Good reading regarding how to measure and judge acceptable voltage drop across a ground.
https://www.fenderbender.com/running-a-shop...ircuits-part-11 The most misunderstood aspect of the stater is that it typically draws 50-100 amps of current while cranking. This is in addition to the 25 amps of current that the Bosch starter solenoid needs to draw to pull in and operate the actual motor correctly. It only takes a minute amount of resistance in the ground cable to cause HUGE problems due to the high current draw. As an example .01 ohms of resistance in a ground cable will drop 1.25 volts (way too much) if drawing 125 amps of current while cranking. |
dtmehall |
Jun 8 2024, 08:38 PM
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#3
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Newbie Group: Members Posts: 34 Joined: 21-December 23 From: Farmington Hills, Michigan Member No.: 27,808 Region Association: Upper MidWest |
Good reading regarding how to measure and judge acceptable voltage drop across a ground. https://www.fenderbender.com/running-a-shop...ircuits-part-11 The most misunderstood aspect of the stater is that it typically draws 50-100 amps of current while cranking. This is in addition to the 25 amps of current that the Bosch starter solenoid needs to draw to pull in and operate the actual motor correctly. It only takes a minute amount of resistance in the ground cable to cause HUGE problems due to the high current draw. As an example .01 ohms of resistance in a ground cable will drop 1.25 volts (way too much) if drawing 125 amps of current while cranking. |
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