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#1
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Multimeter leads won't reach opp. sides of car
Hi, everyone.
I suspect I have a few bad glow plugs and am trying to diagnose the problem. I need to connect my multimeter leads to the neg. battery terminal and the glow plug relay. However, the leads that came with the multimeter are too short. I have found lead kits online, but many don't specify the length of the leads, and they also seem very expensive ($20 leads for a multimeter that cost $15). Can anyone recommend local chains where I can find longer leads?
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1983 Mercedes 300D Turbo / 268k miles Zero-knowledge Mercedes repair project: mercbenzn00b.blogspot.com |
#2
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The negative battery terminal is ground. You can connect your lead to most anything metal that you can find in the engine compartment and it will be the same reference point.
Good luck, |
#3
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Why not use any kind of wire ?
I needed the same thing last week and used solid copper 4 strand phone wire. A different time I used some speaker wire. Especially for really long runs, like when I want to read the meter while sitting in the car. You can choose to alligator clips if you plan on doing this a lot.
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80 300D 340K Owned 30 yrs 83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day 02 Z71 Suburban 117,000 15 Toyota Prius 2600 miles 00 Harley Sportster 24k 09 Yamaha R6 03 Ninja 250 |
#4
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Thanks, Larry. I'd forgotten this from physics class... I believe I need to refresh my basic knowledge of electricity.
rhodes, that's a good idea as well. I'll probably just fashion something out of regular copper wire if I need this kind of application in the future.
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1983 Mercedes 300D Turbo / 268k miles Zero-knowledge Mercedes repair project: mercbenzn00b.blogspot.com |
#5
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I'm curious.
If you were to lengthen the leads, would you now create more resistance(ohms) and skew the readings? Been a long time since my last physics class as well.
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Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein" |
#6
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Lengthening the wire the distances we are talking about here will not create an appreciable resistance.
Have a great day, |
#7
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Or just subtract from the meter reading...
Test the wire for resitance from one end to another. Then just subtract that number from each of your meter readings.
For example, if you measure the wire as having 10ohms resistance and then test out a glow plug and get 50 ohms, the actual resistance of the plug is 40 ohms. Neal
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'83 300SD 335,000km (207k) mi SOLD '87 560SL 163,000km (101k mi) SOLD '86 300SDL 356,000km (220k mi) SOLD '92 500SEL 250,000km (155k mi) SOLD '90 300SL 140,000km (87k mi) SOLD '01 S430 260,000km (161k mi) SOLD '03 SL500 167,000km (104k mi) SOLD '07 S550 4MATIC 235,000km (146k mi) SOLD '07 GL320 CDI 4MATIC 348,000km (215k mi) '13 GL350 BlueTec 4MATIC 170,000km (105k mi) '14 SL550 72,000km (43k mi) |
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