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JK McDonald JK McDonald is offline
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Join Date: Oct 2003
Location: Texas
Posts: 912
Could Be - Definite Maybe

Hey Gab - There are other members with lots more experience who will probably think of more suggestions, But 1st - Have you had any previous charging issues ? Electrical problems can generate lots of "It Could Be and Definite Maybe" discussions but a hot spot in a circuit is typically caused by one of the following basic reasons :

1) High Localized Contact Resistance, 2) Higher Than Normal Voltage or 3) Higher Than Normal Current (Electrical Load).

High Contact Resistance can be from - Over Heated, Dirty, Contaminated or Loose Wiring Connections and/or Poorly Crimped Terminal Lugs.

High Voltage = Voltage Regulator Malfunction. This can be easily verified using a Volt Meter and is rarely the direct cause of a hot spot issue.

High Current can be from - Heavy Electrical Load (Examples - From Failing/Internally Shorted Battery, Failing Ignition Control Unit, Failing Starter (Bendix is Not Disengaging ?), Perhaps from an Insulation Failure or Some Exposed B+ Wiring that's Touching Ground.

For the Overall Best Long Term Results also clean and tighten the terminal lugs at the Alternator B+ Output Terminal/Jumper Post/All the Wires going to and from the Pos Battery Post. Also Inspect the Ground or Return wiring - Neg side of the charging circuitry. Both ends of the Neg Battery Cable, Engine to Frame Grd Cable, Several smaller Grd Terminal Lugs above fuse panel, etc.... Reseat all the relays and inspect the relay legs and sockets for corrosion.

Keep Us Posted and Good Luck, Michael
1984 928S - "Miss Purdy"
1987 911SC - "Frau Helga"
1986 930 - "Well Hung"
1975 911 Targa "Blue Who"
2006 Audi A6 Quattro "Howdy Audi"
Old 01-14-2018, 06:03 PM
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