upgrading alternator on '86 270 sundancer

[ranfot]

Hi All,

I have '86 270 Sundancer with Dual Mercruiser 262 4.3L engines.
I'd like to upgrade both 55A alternators to 100A or higher.
Can someone let me know the part number or which car has alternator with higher amps that will fit the engine.

Thanks.

 

[Pachanga Boy]

totally shooting from the hip but I think you could have your existing alternators rebuilt to a higher amperage...although I'm unsure you can fit another 45A in the existing casing usualy you can only get another 20-30A but it's probably alot cheaper then new ones....just a thought

 

[sdarc]

Boat alternators are different than car alternators in that they are "spark protected". A regular car alternator is not. You might try to upgrade the internals of your old one. Summit Racing or jegs have kits. But DO NOT alter the spark arresting safe guards.

 

[ranfot]

I have purchased Duralast/12 Volts, 800 CCA marine battery. Total it will be 4 of them (2 for each side) My friend has suggested that it won't be enough for original alternators to charge them. Other than that, there is nothing special on the boat: powerful radio, fridge, electrical stove, lights. probably a TV(LCD)
I have found this alternator: http://www.dbelectrical.com/p-3609-...ine-alternator-mercruiser-1-wire-adr0334.aspx

will it work, or should I re-consider upgrading ?

thanks