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Electrical Questions and Answers This is the place to ask all your question about electrical problems and instalation issues.

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Old 05-09-2019, 04:48 PM   #1
mdm1957
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Default alternator ?

my 57 was converted to a 3 wire alternator---not charging battery---previous owner installed new wiring but i dont think they are connected correctly--- the 10 gauge wire from the batt terminal on alternator and smaller black wire from the alt plug are run together to the starter solenoid and are joined together with the black wire connecting to a small terminal on the solenoid--i cant figure out why the black and red were joined at that point and why the red wire wasnt connected to the batt terminal on the solenoid or run directly to the battery---can i disconnect the red batt wire from the alternator and run another 10g wire directly to the battery without hurting anything the way its wired now i dont think im getting any power to the batt---checked alternator ---putting out 14+
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Old 05-09-2019, 05:02 PM   #2
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my 57 was converted to a 3 wire alternator---not charging battery---previous owner installed new wiring but i dont think they are connected correctly--- the 10 gauge wire from the batt terminal on alternator and smaller black wire from the alt plug are run together to the starter solenoid and are joined together with the black wire connecting to a small terminal on the solenoid--i cant figure out why the black and red were joined at that point and why the red wire wasnt connected to the batt terminal on the solenoid or run directly to the battery---can i disconnect the red batt wire from the alternator and run another 10g wire directly to the battery without hurting anything the way its wired now i dont think im getting any power to the batt---checked alternator ---putting out 14+
Yes, the red wire from the alternator output should go directly to the battery terminal of the starter solenoid. The #2 terminal of the small plug can also go to the battery terminal of the starter. The #1 terminal needs to be connected to the small brown wire that was on the generator.
The body needs to be grounded to the engine.
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Old 05-10-2019, 09:31 AM   #3
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Yes, the red wire from the alternator output should go directly to the battery terminal of the starter solenoid. The #2 terminal of the small plug can also go to the battery terminal of the starter. The #1 terminal needs to be connected to the small brown wire that was on the generator.
The body needs to be grounded to the engine.
would the engine run if there was no ground / body to engine or would it just run and not charge the batt
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Old 05-10-2019, 09:55 AM   #4
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would the engine run if there was no ground / body to engine or would it just run and not charge the batt
The engine would run fine and charge the battery. The gauges, lights, and accessories wouldn't work right, because they are grounded to the body. There would be some grounding through the linkage, but it wouldn't be consistent. The 57 body ground was originally from the generator to the voltage regulator mounting. When the voltage regulator is removed, many times that ground is removed also.
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Old 05-10-2019, 04:19 PM   #5
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Default alternator

first of all tks don for your replies-----checked all wires --appear to be correct --two wires coming from the alternator going to the batt terminal on the starter solenoid---alternator reads 14+ but nothing appears to be going to the batt --reads just under 12---- voltmeter reads just under 12. im stuck
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Old 05-10-2019, 04:45 PM   #6
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first of all tks don for your replies-----checked all wires --appear to be correct --two wires coming from the alternator going to the batt terminal on the starter solenoid---alternator reads 14+ but nothing appears to be going to the batt --reads just under 12---- voltmeter reads just under 12. im stuck
With the engine off, read the voltage at the alternator output terminal. It should read 12.+ (battery voltage). If not you may have a blown fusible link or bad connection.
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Old 05-10-2019, 08:04 PM   #7
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With the engine off, read the voltage at the alternator output terminal. It should read 12.+ (battery voltage). If not you may have a blown fusible link or bad connection.
engine off alt reading -0- where would i locate the fusible link
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Old 05-10-2019, 09:07 PM   #8
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engine off alt reading -0- where would i locate the fusible link
At the starter end of the red wire. It will be a different color short length of wire if it has a fusible link. If you don't see a fusible link, look for a break in the red wire or a terminal end crimped to the insulation instead of the wire. The red wire could be rubbed into by the fan belt or pulley or burned into by the exhaust.
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Old 05-11-2019, 08:06 PM   #9
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At the starter end of the red wire. It will be a different color short length of wire if it has a fusible link. If you don't see a fusible link, look for a break in the red wire or a terminal end crimped to the insulation instead of the wire. The red wire could be rubbed into by the fan belt or pulley or burned into by the exhaust.
looks like the fusible link bit the dust ---i have a 100 amp alternator with a 10 or 12 gauge wire---what size and type fusible link would be right tks
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Old 05-12-2019, 12:46 PM   #10
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There should not be any fusible link (or anything similar) between the alternator, starter (solenoid battery terminal) and battery. Only the large battery cable to the starter and a large wire (10 GA) from the alternator to the starter.

Any fusible link should only be between the power source (solenoid battery terminal) and the wire going to the under-dash harness to prevent electrical fires in the car.
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