FJ45 Troopy Alternator Help (1 Viewer)

[thenative1]

Hi All,

Quick context: I have an '84 RHD Troopy that I love dearly and generally runs like a top. It has two batteries: primary and aux (nothing currently connected to the aux) with an Ironman system to manage between the two. Truck has a dual-fuel system (propane and gas) from a previous life with the ability to switch between the two via a toggle beneath the dash. Separate issue but it's currently not working 'cause it's almost impossible to find a U.S. mechanic who knows about propane systems for cars but that's a problem for another post.

The more pressing issue is that I recently noticed that the primary is not charging when the truck is running. Confirmed that there is power to the back of the alternator. A few quick questions before I start chasing answers:

1) Can anyone identify the box in the picture below? Mounted to the passenger's side firewall. Likely aftermarket, installed by the previous owner.
2) Do the typical alternators for this era have an internal voltage regulator?
3a) If "no" to #2, where is the voltage regulator?
3b) is there a separate fuse for the voltage regulator?

Thanks all!

 

[Mark Jennings]

If it’s a Toyota alternator, should have an external voltage regulator.

 

[charliemeyer007]

That look like a voltage regulator to me. No clue about your ironman system. When I put my enlarged battery tray in so I can run 2 big batteries I'm going to make my own big knife blade rocker switch. It will allow me to select which battery via the +terminal, to use or have both on tap. Both -neg terminals will be grounded to the engine and frame.
Most propane carbs have a electric solenoid to open the valve for propane flow - should also cut power to the gasoline electric fuel pump. DPDT type switch.

 

[thenative1]

Thank you - all very helpful. Need to determine if there is a fuse for either/both the alternator and/or the voltage regulator.

 

[45Dougal]

The field line is switched by the ign switch, via the engine fuse.
Test for voltage at each pin on the regulator.
You should be able to measure 12V on one pin with the ign switched off. This is the charging wire and should increase to ~14v when running.
You should also be able to measure 12V on the field wire, but only with the ignition switched to on.
Check and clean the connections at the ignition switch, fuse panel, and regulator connector.

Curious to see what your LPG install looks like on a 40. I used to have one on my Jaguar S-type. Very common in Europe due to fuel prices.