x2 on the meter JamesDean suggested. They are plentiful on ebay for around $10 and being digital take a fair share of abuse (read that as being used by DIY'ers who know very little of meter use)

There are just a few meter things to know.

Do not every attempt to measure resistance with any power on the circuit. Doing so will usually result in the immediate destruction of that R reading position. Such as the 200 which is the most common scale we use.

Nice to check the meter by shorting the leads which should result in a 0 reading. If it doesnt note what it is .02, .03 so that when you check glow plugs you can subtract the shorted reading.

Voltage is taken with the Black lead, Com, sitting on ground and the Red to the area voltage is being checked like a fuse. Measure the DC volts at one end of the fuse ... 12 volts ... move to the other and read 0 volts you have a bad fuse.

Note that Resistance and Voltage readings are taken with the Black pushed into the common and the Red into the middle location.

Current readings are taken with the Red moved to the top position. A good rule of thumb if you arent used to reading current always start with the largest range ... in this meter 200M.

Measuring current is a tad more difficult in that the meter has to be inserted into the circuit usually by cutting a wire or a trace.

__________________
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."