The Stovebolt Site Forums The Shop Area Engine Shop Anyone install a 2nd alternator on a 292?

Thinking about setting up another alternator on my 292 to feed a second 12V system for the home parts of the Grumman RV.

I have a spare groove on the crankshaft pulley. Any tips on brackets and such for an installation?

There is a splitter that lets the alt charge 2 bats. but only one is used for running the vehicle. Most RV's & service trucks use this system.

I think it is called a battery isolator. I had one on my 84 pickup to power my cabover camper. All you need is another batter the isolater and a place to mount the extra battery. The way it works is as you drive, the alternator charges the main battery. Once it is charged then it charges the second battery. As the name indicates it also isolates the two batteries, so you always have a charged battery.

My inverter peaks at 5KW, so I need a large battery bank AND alternator to power it, more than the present alternator and battery can handle.

This machine already has 3 power systems on board; a 12VDC engine and running gear system, a 12VDC "house" system and a 120VAC "house" system for shore power or generator.

Separate systems will allow the most flexibility. A few brackets and minimal wiring, and it is done.

It would be a lot simpler to upgrade to a large single alternator, maybe a 200 amp capacity, or something similar. Check into adapting your existing mounting system to allow you to install an alternator like a tractor-trailer system would run. It's virtually impossible to have too much amperage capacity, as the battery will only accept enough current to charge itself. Once both battery banks are fully charged, the regulator will cut the alternator back to a minimum charge, no matter what the upper current limit might be. When I ran a diesel shop service truck, I had an 8D series 12 volt battery that weighed about 120 pounds, and a 200-amp brushless alternator. My booster cables were made from 1-0 welder cable and would carry over 1,000 amps. Boost-starting a big rig was no problem!
Jerry

i had to make my brackets when i put a gmc top kick alt on my 292 it had the heavy duty bearing's and regulator .model 21si 100amp #1117886 i just used a good used one and changed the pully .here is a sample http://www.motorcityreman.com/deoe1111111113.html

in my 66 with a 292 i always had two heavy duty batteries. i have had them hooked up parallel, i believe, without the isolator and then with a a switch to chose the battery. the reason i did was the heavy winch i had. i just had the stock 60 amp alt i think. i now have just one battery with a 100 anp alt in my 64 with the same winch. any way i have had it it would drain the battery/batteries with the engine running with much use. i think everyones ideas about just a single heavier amp alt is best. i just had to learn to pace myself, not much help huh.

I run a large case one wire that will sustain a true 180 amp. under const. load to two 27 series batts in parallel ( I do not need the iso for back up) ran lights fans TV and frig for 14 days after a tornado hit our property 5500 with a boost of 6800 inverter

Then running a 5000btu AC and a mini frig from the inverter while driving should be no problem! Any tips on selecting the right alternator, or is it a standard item?

Seems like I remember reading that the 292 has a longer shaft on the alternator...