steves hilltop farm
New User
a friend of mine has a farmall H with the 6 volt still on it would like to put a one wire 12 volt alternater does anyone know the wireing diagram.
thanks steves hilltop farm
thanks steves hilltop farm
- Thread starter steves hilltop farm
- Start date
gary in canada
Member
attach a wire to the stud on the back of alternator run this wire to the amp gauge, you will need to reverse the wires on the gauge as originally the H was positive ground
Janicholson
Well-known Member
The one wire Delco is equipped with a regulator that is self exciting. It has two problems, one is that it needs to be operated at 3/4 throttle or more to begin making volts. (it continues after that even at idle) The second is that they tend to run down the battery between uses. They kinda leak current when not being used.
The easiest way to use the multi wire system is simple. Use a NAPA oil pressure switch that turns on with pressure of 5psi, and is open when no pressure is on it. "T" This switch into the oil pressure port and run a Hot wire from the starter sw. to the pressure sw, then from the pressure sw to the #1 terminal on the alternator (The standard SI-10 unit) This needs no diode, no idiot light or any thing else. The #2 terminal hooks as shown to the Big terminal on the alternator (just a short wire) The big terminal hooks the the load side of the amp meter (which must have its leads reversed to show charge with negative ground. JimN
The easiest way to use the multi wire system is simple. Use a NAPA oil pressure switch that turns on with pressure of 5psi, and is open when no pressure is on it. "T" This switch into the oil pressure port and run a Hot wire from the starter sw. to the pressure sw, then from the pressure sw to the #1 terminal on the alternator (The standard SI-10 unit) This needs no diode, no idiot light or any thing else. The #2 terminal hooks as shown to the Big terminal on the alternator (just a short wire) The big terminal hooks the the load side of the amp meter (which must have its leads reversed to show charge with negative ground. JimN
buickanddeere
Well-known Member
A 12V conversion is too often a "band aid" repair for starting problems blamed on 6V . Instead of on worn engines, mis-adjusted valves,sub-standard ignitions systems, frayed/undersized wires/cables, too small battery and carbs requiring rebuilding/adjustment.
Ever look and see how many ignition coils are connected backwards?
An alternator hung off the side of an antique is butt ugly as well.
Plus many tinkerers thing a $49.99 Napa alternator and a $49.99 battery is going to be a cheap fix for all problems.
Then the tinkerer shows up here with a machine that doesn't run at all, a tangle of wires and often smoke/flames.
Ever look and see how many ignition coils are connected backwards?
An alternator hung off the side of an antique is butt ugly as well.
Plus many tinkerers thing a $49.99 Napa alternator and a $49.99 battery is going to be a cheap fix for all problems.
Then the tinkerer shows up here with a machine that doesn't run at all, a tangle of wires and often smoke/flames.
I'd go with Mikes idea and use a 12 volt generator. Most alternators are too big to mount under the hood of an H. You'd have to cut a hole. Most diesel tractors of that era used a 12 volt Delco generator that will bolt right on in place of that 6 and still look original. No change to the wiring either. Just have to use the matching 12 volt regulator.
john in la
Well-known Member
"No change to the wiring either.
Just have to use the matching 12 volt regulator."
And rewire or replace the coil to work on 12 volts.
Just have to use the matching 12 volt regulator."
And rewire or replace the coil to work on 12 volts.
Why not get a 8 volt battery and then the only thing to change is the output on the regulator. Needs to be set to 9.2 volts.
8 volts is easier on the starting motor then using 12 volts and it spins the engine over just as fast. I'v changed over all my tractors, 3 H's, 1 M and 1 A and have had no problems.
8 volts is easier on the starting motor then using 12 volts and it spins the engine over just as fast. I'v changed over all my tractors, 3 H's, 1 M and 1 A and have had no problems.
HobbyFarmerInWI
Member
I put a 6 volt, positive ground alternator on my Case 300. That and the biggest cables I could find and the old girl starts no matter how cold it gets.
Anonymous-0
Well-known Member
Neat idea
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