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Checking ohms on components

EFI Wiring Fundamentals

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Discussion and questions related to the course Motorsport Wiring Fundamentals

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So if I want to check my RacePak data logger do I simply put my multi meter set to ohms across the earth and power wire to check resistance?Thanks for the help

Hi Andrew can you tell me what you would be checking for ? does it not go at all or do you have a communication issue etc

Regards Ross

Good evening Coley, What are you trying to troubleshoot?

Is the racepak not turning on?

Is the racepak turning on just not working correctly?

Need a bit more details of what you are trying to accomplish.

I'm going to go out on a limb and suggest he will be trying to find the correct wire size to use based on the resistance and 14.4v operating voltage.

Hey boys thanks for the reply’s yes Brian I’m asking how I check each component for wire size needed

Sorry I am not sure how this is done myself so hoping Ross or Zac can give you the info you need.

You will not be able to measure the resistive load of a solid state device in this way.

You can either power it up on the bench with an ammeter connected in series, or take a guess. Also, racepak usually has all those "V-net" modules which are all powered from the logger, so you will want all those plugged in when measuring its draw too. My guess is less than 2Amp.

You may find something on the forums specifically focused on the 'logger you're using. I had a quickish look on the Holley site and couldn't find anything useful - which I was a bit surprised by, TBH, as spec'ing the minimum may prevent some service calls.

Might be worth giving their support dept a call to check?

As with most things, if in doubt upsize by one or two gauges, and use a clean source and ground - there's a tiny weight penalty but may prevent problems later if it turns out the voltage across the device is less than expected under full load.