The purpose of this modification is to allow the MOBI-ARC’s PWM regulator to control the alternator. Read through these pages before undertaking modification. People not mechanically inclined may choose to have a local alternator re-builder facilitate this modification.
In its original configuration, this alternator uses diodes within the rectifier plate known as “avalanche” diodes. Avalanche diodes are fine for charging, but they are incompatible for welding due to their limited voltage breakdown rating. In order to use the MM alternator, a rectifier plate with standard diodes must be installed. We’ve manufactured bolt-in rectifier plates with standard diodes. The rectifier plates look identical, but electrically they different.
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The vehicle’s charging system is not working properly even though the alternator has been replaced. Cause: This alternator has a P – D style regulator, or external driver. Correction: For this Dixie Tech Tip only topic of the P–D regulator will be covered. For the following topics refer to the appropriate Dixie Tech Tip:
• Voltage Drop Testing – TSB-001
• Alternator Trouble Shooting Guide – TSB-010
• Alternator Installation Guide – TSB-011
• Alternator Pulley Installation Guide – TSB-012
• Why batteries can not be disconnected to test alternators – TSB-013
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