63 bg 241 - engine almost dies when anything with electric is turned on

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lpfullmetal

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I have 63 c100 with a bg 241. So im running into a issue that the engine will almost die (and sometimes does) when I turn on the blinkers or lights, fan, brakes. Ill admit that I don't know that much about electrical logic on vehicles, but do you think I have a short somewhere ?
 
How long has this been going on? Is it something that was barely noticeable a short while a go and seems to be getting progressively worse, or did it come suddenly from out of nowhere? I'd be leaning more towards a weak battery and/or problem with your charging system, since nearly any electrical load big or small seems to trigger the symptoms. Have your battery load tested and your generator output and voltage regulator checked out. It never hurts to give your ground connections and your circuitry between the battery to starter to firewall connector to ignition switch to generator a thorough inspection for loose connections, corrosion and frayed or crispy wires.
 
ihpartstrever said:
how long has this been going on? Is it something that was barely noticeable a short while a go and seems to be getting progressively worse, or did it come suddenly from out of nowhere? I'd be leaning more towards a weak battery and/or problem with your charging system, since nearly any electrical load big or small seems to trigger the symptoms. Have your battery load tested and your generator output and voltage regulator checked out. It never hurts to give your ground connections and your circuitry between the battery to starter to firewall connector to ignition switch to generator a thorough inspection for loose connections, corrosion and frayed or crispy wires.
Click to expand...

I have a new battery. I put a multimeter on the altenator and and it reads 14.5, but when I turn the blinkers on or the brakes it drops to 14.29-14-25.
 
So this has an alternator and not a generator? I'm assuming it has an external voltage regulator either way, unless someone converted it to an internally regulated unit.
 
14.5 volts is a bit high, 13.6 - 14 is normal. I'd bet you've got a short in the system somewhere. Are there fuses in the system? What's the amp rating of the alternator? I've built 12v chargers with 5.5hp engine and 63amp alternator and once the load is applied it will kill the engine. Also is the idle on the bg241 good? What vacuum does it pull at idle?
 
Here is a schematic for a c-100 through a c-130.

You probably have some weak connections at the ammeter, the ignition switch, and possibly the bulkhead connectors.

Check for voltage drop between the battery and any one of those connections, say between the batt+ and the b terminal on the ignition switch with the lights or wiper on. Also check for voltage drop between the battery and the I terminal on the switch. Any connection in the path from batt to the ammeter to the switch which is not good contact can make for such a drop in voltage that any load can reduce the voltage to the coil enough to kill the engine

tarnished connections can also make your charging voltage high if the regulator can't "see" true output or voltage.

Cleaning all conductor ends and connections is some labor, but cheaper than chasing your tail throwing parts at it. ;)
 

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