Relay testing for Novice Technicians
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- Andy.MacFadyen
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" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
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It is one of those tests that is very easy to make a mistake on and short the wrong terminnals.
Totally agree with Andy. Gotta be careful.
I've done it many times but if you're not sure don't do it.
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This is a great video about troubleshooting a relay controlled circuit. Probably one of my favorite in recent history.
The 120ma current draw is just on the coil side of the relay, so jumping 30 and 87 would allow you to measure the current of the pump, not the relay itself.
"Ground cannot be checked with a 10mm socket"
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- matt.white
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"Ground cannot be checked with a 10mm socket"
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Also like the Power Probe as you can see in the video:
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- matt.white
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One feature I liked about the look of the uactivate was the loop for an amp clamp. I don't have one though. Still looks cool.
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- Andy.MacFadyen
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www.maplin.co.uk/p/maplin-automotive-relay-tester-a19qx
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
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Sorry I didn't bother with the link. I'm on here on my phone normally.
No problem Matt!
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matt.white wrote: That was a good refresher one Noah. Another that springs to mind was when Paul diagnosed the starter on his sons celica. He broke out the uactivate (spelling) relay bypass tool.
I'd LOVE to have one of those. And one of the Smart BOBs , too
I've been getting by pretty well with this Lisle relay test set . Exactly like the ones featured in the Bad Engine Computer testing series. Very handy, but it's still possible to jump the wrong terminals if you're not careful.
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www.tooltopia.com/innovative-of-america-...NbHYiV8VPhoCAfvw_wcB
I use these at the fuse box:
www.amazon.com/307M-Fuse-Buddy-Mini-Curr...es+fuse+current+loop
www.amazon.com/308B-Fuse-Buddy-Current-L...es+fuse+current+loop
ASE Certified Master Automotive Technician + L1
ASE-5578-5149
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I've been getting by pretty well with this Lisle relay test set.
Nice man. But still + $120
Why does everything have to be so expensive
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- FlyinHawaiian
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I use this to test relays www.amazon.com/ESI-193-Black-Diagnostic-Relay/dp/B00NI10152
*shaka*
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When I have the time, I'll run it through a bunch of tests and let you all know how it goes.
That would be cool. Nice link by the way, like that relay tester.....
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Monde wrote: Hello
Does the pcm have anything to do in the starting system of this car? If the clutch switch when closed send a signal to the computer, there must be a reason for it, right?
Not sure what car you're referring to Monde :blink:
But, if the clutch switch is a PCM input, it's probably one of several inputs it must receive before the PCM will activate the starter relay.
I hope that's what you're asking about.
"Ground cannot be checked with a 10mm socket"
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