What the heck is this?

OEM wiring was clipped to the left hood rail you can still buy the clips. When rolling my own it’s rare for me to clip it to the hood but sometimes I do it. The last one I did I was out of 6V harness I had to roll my own. I told JMOR how I use a OEM 6V harness and he made up a diagram for it.

With the cost of quality parts/labor it’s not a good idea to pay me to make a harness. 12V and a alt it’s a good time to dump that amp meter and replace it with a voltmeter. This will bring out the amp meter lubbers that don’t understand a voltmeter is the gold standard when diagnosing your electrical system.
Lubber here! I will 100% agree that when trouble shooting electrical issues I grab the voltmeter. The bad rap a tractor mounted amp meter gets is due to the lack of understanding as to how to wire it in the circuit. If it is wired as a net Amp meter it instantly indicates whether the battery is being charged, balanced or draining. Many electrical diagrams available show the Amp meter only wired as a alternator/generator output meter which is of limited value. However, I surely would not add an Amp meter to a tractor if it didn't already have one and if you want a gauge to monitor a running tractor's electrical system that is the easiest to connect and understand the Volt meter is the one to go with. My current project has a generator light that is even simpler to understand although the wiring may be a little more complicated.
 
A clip fell out when I removed the hood, wasn't sure where it came from, I'll have to check it out! I'm assuming any ol voltmeter that would fill the hole be sufficient? Gonna order a fuel tank soon, and pick up a 12v coil so I can add the voltmeter to the shopping list. Thanks!
I will have to get you the # for the voltmeter the one I use is for a MF tractor they are cheap enough. The coil # I made famous is NAPA # IC14SB are cross reference it over.

Looks like you need to search for a differnt diagram. :) There is absolutely nuttin wrong with using a 6V coil on a 12V system as long as it set up correctly. It’s been done millions of times and the go to on most all OEM applications
 
I will have to get you the # for the voltmeter the one I use is for a MF tractor they are cheap enough. The coil # I made famous is NAPA # IC14SB are cross reference it over.

Looks like you need to search for a differnt diagram. :) There is absolutely nuttin wrong with using a 6V coil on a 12V system as long as it set up correctly. It’s been done millions of times and the go to on most all OEM applications
Thanks for the info. I'm going to replace the coil due to it being quite rusty and swollen, and I'll go with the 12v so I can eliminate the connections to the resistor, which is just haphazardly dangling about. Just a couple less opportunities for bad connection you know.
 
Just an update on the wiring, I've left the 6v coil and resistor installed for now ($$). Tidied up the wiring quite a bit though. Waiting for a new fan belt then the hood (with new gas tank) will go on and I'll let it run to warm up then change oil. After that I have to focus on the tires. Fronts are in pretty good shape, rears were brand new when it was stored 25 years ago, but weather cracked really bad.
 

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