Heavy Duty Alternator

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Equivalent Replacement Parts for AC DELCO Part Number 321-787

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Part Number	Description	Brochure (English)	Brochure (Spanish)
10459374 10459374 21SI Reman Alternator Status: Obsolete Type: Reman Mount Type: J180 Hinge	21SI Reman Alternator
19020386 19020386 22SI New Alternator Status: Obsolete Type: New Mount Type: J180 Hinge	22SI New Alternator
19020386 19020386 22SI New Alternator Status: Obsolete Type: New Voltage: 12 Rated Output: 100 Amps Mount Type: J180 Hinge B+ Output: 5/16 R Terminal: #10 Remote Sense: No Polarity: Negative	22SI New Alternator
10459374 10459374 21SI Reman Alternator Status: Obsolete Type: Reman Voltage: 12 Rated Output: 100 Amps Mount Type: J180 Hinge B+ Output: 5/16 R Terminal: #10 Remote Sense: No Polarity: Negative	21SI Reman Alternator

Upgrade Options

Part Number	Description	Amps	Feature	Brochure (English)	Brochure (Spanish)	Notes
8600126 8600126 36SI New Alternator Status: Active Type: New Voltage: 12 Rated Output: 170 Amps Mount Type: J180 Hinge B+ Output: 1/4 R Terminal: #10 I Terminal: #10 Remote Sense: Yes Polarity: Negative	36SI New Alternator	170		Download PDF	Download PDF
19020310 19020310 22SI New Alternator Status: Active Type: New Voltage: 12 Rated Output: 150 Amps Mount Type: J180 Hinge B+ Output: 1/4 R Terminal: #10 I Terminal: #10 Remote Sense: No Polarity: Negative	22SI New Alternator	150
8600310 8600310 24SI New Alternator Status: Active Type: New Voltage: 12 Rated Output: 160 Amps Mount Type: J180 Hinge B+ Output: 5/16 R Terminal: #10 I Terminal: #10 Remote Sense: No Polarity: Negative	24SI New Alternator	160		Download PDF	Download PDF	Dual Internal Fans / Tech Tip Video Dual Internal Fan Alternators When replacing an external fan alternator with an internal fan alternator DO NOT take the external fan from the original model and apply to the internal fan alternator. This will result in pulley and belt misalignment. Tech Tip Video: Dual Internal Fans
8600312 8600312 28SI New Alternator Status: Active Type: New Voltage: 12 Rated Output: 160 Amps Mount Type: J180 Short Hinge B+ Output: 5/16 R Terminal: #10 I Terminal: #10 Remote Sense: Yes Polarity: Negative	28SI New Alternator	160		Download PDF	Download PDF	Dual Internal Fans / Tech Tip Video Dual Internal Fan Alternators When replacing an external fan alternator with an internal fan alternator DO NOT take the external fan from the original model and apply to the internal fan alternator. This will result in pulley and belt misalignment. Tech Tip Video: Dual Internal Fans