Two Alternators on 8v71?

PNWorBUST72 · March 05, 2018, 04:36:57 AM

So people have talked about adding a 2nd alt to my bus to help with the battery charging.

Is there a particular process or place people use to do this?

oldmansax · March 05, 2018, 04:51:02 AM

I had a second 12V alternator for the house bank on my '72 MCI. Ran it off the old AC pulley. Had switch for the fields so that I could run it only when I wanted.

TOM

Geoff · March 05, 2018, 05:22:26 AM

On an MCI you can run a double pulley off the back of the blower drive and make mounts for two alternators.

PP · March 05, 2018, 09:38:35 AM

On my bus there is the big 24V for the coach batteries and then a 12V for the house bank. The gauge on the dash only shows me the performance of the 24V when running. the mounting and belt setup is pretty simple and straightforward, just make sure they're rotating in the proper direction if you add one for the house bank.

Will

PNWorBUST72 · March 05, 2018, 10:53:21 AM

Apparently the previous owner rebuilt the gear driven oil cooled one already before I bought it.

Can you guys give me some pics of what your talking about? I am still getting to know the old girl...

HB of CJ · March 05, 2018, 11:24:41 AM

If memory serves the old Detroit 671N and 8V71N mills used in the fire apparatus had two, (2) alternators. Also two, (2) starters? Two starter buttons also. Crazy stuff. Long ago. Far away.

Utahclaimjumper · March 05, 2018, 11:44:01 AM

One of the advantages of alternators is, they don.t care which way they turn other than the cooling fins.>>>Dan

luvrbus · March 05, 2018, 12:07:59 PM

Quote from: HB of CJ on March 05, 2018, 11:24:41 AM
If memory serves the old Detroit 671N and 8V71N mills used in the fire apparatus had two, (2) alternators. Also two, (2) starters? Two starter buttons also. Crazy stuff. Long ago. Far away.

Lol my fire truck has 2 starter buttons but only 1 starter I don't know why it has 2 starter buttons ?

busfan · March 05, 2018, 01:29:41 PM

If your in a sunny place maybe Solar panel would do? Pretty easy to hook up these days.

Templar52 · March 05, 2018, 02:26:36 PM

LUVRBUS. One button is for small fire and the other one for major fires.

Geoff · March 05, 2018, 02:28:04 PM

Quote from: luvrbus on March 05, 2018, 12:07:59 PM

Lol my fire truck has 2 starter buttons but only 1 starter I don't know why it has 2 starter buttons ?

I have three start switches-- 1 up front, one in the middle, and one at the back. Dumb joke, the middle one is for the genset.

HB of CJ · March 05, 2018, 08:21:24 PM

I stand corrected and thank you. The old Seagrave V12 900 something cubic inch gasoline engines had two starters. Two starter buttons. The engine would crank and start with one button pushed but we pushed both buttons. The Detroits only had one starter.

When the shops re powered the apparatus with DDs the two starter buttons were left. I wonder how they worked. Long ago far away. About 1974. Service engine life was very short. I remember helping the shops do engine changes. Much fun and a learning process.

chessie4905 · March 06, 2018, 03:53:21 AM

I have 4 start buttons. Two up front, one of for generator. One in middle at generator. One at rear at engine. Your move.....☺

PNWorBUST72 · March 06, 2018, 04:22:05 AM

Can anyone with 2 alt's share some pics of placement /mounting please?

oldmansax · March 06, 2018, 05:28:35 AM

I can't, don't have that bus anymore.

TOM