# Has anyone used these contactors to replace the factory unit?

**URL:** <https://community.electricforum.com/t/has-anyone-used-these-contactors-to-replace-the-factory-unit/19442>\
**Category:** GEM Forum\
**Created:** [July 21, 2020, 3:10pm UTC](https://community.electricforum.com/t/has-anyone-used-these-contactors-to-replace-the-factory-unit/19442 "2020-07-21T15:10:34Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ApacheshoresGEM](https://avatars.discourse-cdn.com/v4/letter/a/7bcc69/32.png) [@ApacheshoresGEM](https://community.electricforum.com/u/ApacheshoresGEM)\
**Post date:** [July 21, 2020, 3:10pm UTC](https://community.electricforum.com/t/has-anyone-used-these-contactors-to-replace-the-factory-unit/19442/1 "2020-07-21T15:10:34Z")

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> **[Calvas Intricate Chinese Orange 72V 400A DC Contactor ZJ400D for Electric...](https://www.amazon.com/dp/B07WBZK9W9/?coliid=ASIN-B07WBZK9W9-ATVPDKIKX0DER&colid=2ITOYA8XDXCGW&psc=1&ref_=lv_ov_lig_dp_it)**
>
> Calvas Intricate Chinese Orange 72V 400A DC Contactor ZJ400D for Electric Tourist Coach or Sightseeing Car Electric Pallet Trucks - - Amazon.com

I need to replace my contactor. I am considering this as a replacement option. It comes in 400a and 600a.

Has anyone used these? Recommendations please?

We tested my contactor and according to the test procedures it is bad.

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**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\
**Post date:** [July 21, 2020, 3:15pm UTC](https://community.electricforum.com/t/has-anyone-used-these-contactors-to-replace-the-factory-unit/19442/2 "2020-07-21T15:15:39Z")

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Mike and I have. Get the big one.

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**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\
**Post date:** [July 21, 2020, 5:09pm UTC](https://community.electricforum.com/t/has-anyone-used-these-contactors-to-replace-the-factory-unit/19442/3 "2020-07-21T17:09:13Z")

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> [@ApacheshoresGEM](#):
>
> according to the test procedures it is bad.

72v across the coil?  
No click?  
Power off test coil ohms?

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<div class="post-metadata">

**Author:** ![ApacheshoresGEM](https://avatars.discourse-cdn.com/v4/letter/a/7bcc69/32.png) [@ApacheshoresGEM](https://community.electricforum.com/u/ApacheshoresGEM)\
**Post date:** [July 23, 2020, 6:22pm UTC](https://community.electricforum.com/t/has-anyone-used-these-contactors-to-replace-the-factory-unit/19442/4 "2020-07-23T18:22:45Z")

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Followed test procedure in manual. 72V across coil, Step on gas to engage coil, no power to small wire it said to test to. Cant remember procedure right now but tested multiple times, same result.

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<div class="post-metadata">

**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\
**Post date:** [July 23, 2020, 7:34pm UTC](https://community.electricforum.com/t/has-anyone-used-these-contactors-to-replace-the-factory-unit/19442/5 "2020-07-23T19:34:29Z")

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The controller pulls the contactor in by grounding (B-) the coil.  
Leave B+ connected to the coil. Disconnect the other lead going to the controller.  
Complete the coil circuit to battery negative to energize coil.  
If coil is open, no result. If shorted it will spark substantially. Use a fused test jumper if concerned.  
That’s why Gem can tell you to do it that way.  
The coil is a simple electro-magnet. Connect it to battery and it pulls the armature in.