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Using ammeter to jump the load side of a relay

  • Imlearning
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7 years 5 months ago #20274 by Imlearning
Can you check the amperage of a fuel pump by using a ammeter to jump the load side of a fuel pump relay?

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7 years 5 months ago #20276 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Using ammeter to jump the load side of a relay
Yes but keep in mind the amps scale on most multimeters is fused at only 10 amps.

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  • Tyler
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7 years 5 months ago #20290 by Tyler

Andy.MacFadyen wrote: Yes but keep in mind the amps scale on most multimeters is fused at only 10 amps.


Exactly. The inrush current of most pumps will far exceed the 10A of the fuse. It might pop it, might not. :silly: If the fuse type is commonly available, go for it! If it's a Fluke and the fuses are expensive, maybe reconsider.

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7 years 5 months ago #20296 by JeffBirt
Replied by JeffBirt on topic Using ammeter to jump the load side of a relay
If your meter does not use the expensive HRC fuses get a new meter. Well, if you use it on anything over 12V. The HRC 'High Rupture Capacity' fuse is designed to not explode like glass fuses will. If the meter uses them it likely is made with the case compartmented so as to not let an explosion of the fuse out of the case, and into your hand.

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