Thread: Two Alternators
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Old 10-19-2017, 10:24 AM   #1
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Dave_E's Avatar
City: La Conner, WA
Country: USA
Vessel Name: Agnus Dei
Vessel Model: 36' Shin Shing
Join Date: Sep 2014
Posts: 225
Two Alternators

Hi All,

2 owners ago, the guy used this 36' trawler for fishing. He noticed the stock alternator didn't really charge batteries at idle, so he installed a second alternator, strictly for the purpose of trying to get the batteries some charge while trolling at idle.

Bring us up to date. I have an 8D for starting the beast and 2 sets of 6V GCB's for HOUSE 1 and HOUSE 2, shore power (of course), a generator and a monster inverter/charger. That 2nd alternator is a PAIN in the rear for trying to move around down below. If it wasn't for the fact I'm very limber and can squeeze into tight spaces, there's no way to easily get to anything in front of or on the port side of the engine.

The original alternator has a 12g Orange wire that disappears into the engine wiring harness. The second alternator has an 8g wire right to the batteries via an amp gauge.

Does anyone see an issue with me removing the second alternator and not being able to sustain electrical systems while under way?

GOD, Family, career
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