Prestolite Alternator 24V 155A Part No. 1277A730

Prestolite alternator, 24V and 155A, part number 1277A730, supplied as a new unit. It is a twin leg alternator with an internal regulator, insulated return, and an above-ground mounting arrangement.

The unit carries an 18 month warranty and weighs 15kg. Key mounting dimensions listed are 112mm inside mounting legs, with 17mm adjusting hole diameter and 17mm pivot hole diameter, so matching the physical mounting setup is an important check before ordering.

This alternator is described with remote sense and is noted as opposite mount to 1277A740. That mount detail is significant when comparing replacements, even where voltage and amperage look the same on paper.

Key Features

• 24V alternator with 155A output
• New unit, not remanufactured
• Internal regulator
• Twin leg mount
• Insulated return
• Remote sense

Specifications

• Part No.: 1277A730
• Brand: Prestolite
• Type: Alternator
• Voltage: 24V
• Power rating: 155A
• Mount: Twin leg
• Inside mounting legs: 112mm
• Adjusting hole diameter: 17mm

Fitment information

• KING LONG XMQ
• KING LONG XMQ 2010
• KING LONG XMQ 2012
• KING LONG XMQ 2013
• KING LONG XMQ 2014
• KING LONG XMQ 2015
• KING LONG XMQ 2016
• KING LONG XMQ 2017

Application and Buying Notes

When replacing a 24V alternator, the part number 1277A730 is the cleanest reference point, followed by the mounting and electrical details. The twin leg layout, 112mm inside mounting legs, and 17mm pivot and adjusting holes all need to line up with the existing application for a proper installation.

The 155A output is a useful identifier for the charging capacity expected from this unit, but it should be matched against the vehicle’s original alternator specification rather than treated as a universal upgrade. The internal regulator and insulated return are also important because they affect how the alternator integrates with the vehicle’s electrical system.

This unit is listed as opposite mount to 1277A740, which means close visual similarity is not enough when cross-checking replacements. If you are comparing a removed unit, compare the bracket position, hole sizes, and mount orientation before ordering so the replacement matches the existing setup.

The alternator is described as above ground with remote sense and uses high temperature grease and seals for longer bearing life. Those are practical build details, but they do not replace fitment checking. For a heavy-duty electrical component like this, the correct mounting style and application are still the main buying checks.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number 1277A730 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type ALTERNATOR, Unit of Measure EACH, Warranty 18 Months, Inside Mounting Legs 112mm, Power Rating (Amp) 155, Suits Unit Make Prestolite, Note Opposite mount to 1277A740, New / Reman. New, Weight 15kg, Product Group 1 ROTATING ELECTRICAL.

Additional published details for cross-checking include Part No. 1277A730, Brand PRESTOLITE, Description Prestolite Alternator 24V 155A, Adjusting Hole Diameter 17, Pivot Hole Diameter 17, Regulator Type Internal, Voltage 24, Alternator Mount Twin Leg, Insulated Return Yes.

Prestolite Alternator 24V 155A. Part number 1277A730 should be checked first. Listed voltage is 24. Listed output rating is 155. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Twin Leg. Regulator type is Internal. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 1277A730, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a alternator in workshop, fleet, trade, agricultural, or construction service, the listed voltage 24 and output 155 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment using part number 1277A730, the 24V 155A specification, twin leg mounting, 112mm inside mounting legs, and the note that it is opposite mount to 1277A740 before purchase.

FAQ

What is the part number for this alternator?

The part number is 1277A730. For this listing, part number 1277A730 is the main reference point. Listed voltage is 24. Listed output rating is 155. Published fitment references include KING LONG XMQ, KING LONG XMQ 2010, KING LONG XMQ 2012. These details should still be checked against the original unit before ordering.

What voltage and output does it have?

It is a 24V alternator with a 155A power rating. For this listing, part number 1277A730 is the main reference point. Listed voltage is 24. Listed output rating is 155. Published fitment references include KING LONG XMQ, KING LONG XMQ 2010, KING LONG XMQ 2012. These details should still be checked against the original unit before ordering.

Is this a new or remanufactured unit?

It is listed as a new unit. For this listing, part number 1277A730 is the main reference point. Listed voltage is 24. Listed output rating is 155. Published fitment references include KING LONG XMQ, KING LONG XMQ 2010, KING LONG XMQ 2012. These details should still be checked against the original unit before ordering.

What mounting details are provided?

It is a twin leg alternator with 112mm inside mounting legs, 17mm adjusting hole diameter, and 17mm pivot hole diameter. For this listing, part number 1277A730 is the main reference point. Listed voltage is 24. Listed output rating is 155. Published fitment references include KING LONG XMQ, KING LONG XMQ 2010, KING LONG XMQ 2012. These details should still be checked against the original unit before ordering.

Does it have an internal regulator?

Yes. The regulator type is listed as internal, and the unit also has insulated return. For this listing, part number 1277A730 is the main reference point. Listed voltage is 24. Listed output rating is 155. Published fitment references include KING LONG XMQ, KING LONG XMQ 2010, KING LONG XMQ 2012. These details should still be checked against the original unit before ordering.

What fitment information is available?

Fitment information supplied includes KING LONG XMQ applications, with sample listings for 2010, 2012, 2013, 2014, 2015, 2016, 2017, 2018, and 2019. For this listing, part number 1277A730 is the main reference point. Listed voltage is 24. Listed output rating is 155. Published fitment references include KING LONG XMQ, KING LONG XMQ 2010, KING LONG XMQ 2012. These details should still be checked against the original unit before ordering.