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Cat 320l main relay getting hot and ecm question

Usrjcro11 ยท 2019-09-27 07:59

was having troubles with ecm see my earlier post. Replaced old relay with new relay. Both these relays get hot with key on. Is this normal? Can I send my ecm off to somebody that can check or rebuild it? Can somebody test my ecm on there machine? S/n 9kk2063 Thanks

Replies4
  1. #1Ct Farmer2019-09-27 08:38

    When you say hot, are we talking can't touch it hot or just warm?

  2. #2Usrjcro112019-09-27 19:58

    You can hold the relay but it is very warm. It will not burn you

  3. #3Vetech632019-09-27 20:11

    Make sure the relay is the right voltage rating.

  4. #4Ct Farmer2019-09-27 22:03

    Exactly. Relay getting warm is expected - but not hot. Look for wrong voltage rating as stated or if the harness has been hacked and some item placed in series with the relay coil. Also has someone added an item with a large draw on the load side of the relay? Short in the harness? Make sure the relay is capable of switching the amp load it needs to. You could measure the amp draw of the coil and load to see if both are as expected.