An analog meter will do. If we have to do some voltage drop tests, a digital is easier to read. You will need to set it to read 12V. That would be 0-15 or 0-20 etc., depending on your voltmeter.
The first thing you want to do is touch the leads to the battery posts (red to pos., black to neg.), and then do it again with the headlights and key on. You should have approximately 12V (it may drop .5-1v when you turn the lights and key on) on these tests, if not then the battery is low. You will have to charge or replace it as necessary.
Do the same connecting to the terminals, without a load, then then with a load (key and headlights on). The results should be roughly the same. If the lose voltage, then move the lead from neg. terminal to the post and see if you regain voltage. likewise with the pos. lead.
If the voltage is not lost at the battery, then connect the neg. lead to a good ground on the engine. Again, run the test without a load, then with a load. Check voltage at the pos. terminal. If you lose voltage, there is a problem with the neg. cable.
If not, then check voltage at the #1 10A fuse in the relay box. Again without, then with a load. I suspect that at this point you will have found a problem. Let me know what you find and we can go from there.
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