FICM Relay

[Jacup84]

Should the ficm relay have 2 full time hots 1 key hot and 1 ground??. I have to hots and 2 nothing showing with key on/off

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[southend]

I wont sugar coat it, relays are easier to replace than test sometimes. What kind of problem are you having?

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[Jacup84]

No start after studs hg oil cooler and hpop starter... went to test ficm it has a 4 post so went to post closes to driver side no voltage with key off on or cranking

[Jacup84]

I was thinking blown fuse broke wire or ficm bad

[southend]

Ahhhh, I remember your thread, keep it updated others will chime in. Wished I knew more about that, call ed @ ficmrepair.com, he will walk you through the ficm problems.

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[1fastTRX]

The post next to the drivers side one that you tested is the ficm voltage input. From left to right it should be: ground, ground, 12v input, 48v output. If you don't get the 12 volt input w/ the key on then check the ficm relay and harness is fully seated.

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[Jacup84]

I had 2 w 12v to grounds. I am just not getting any reading from actual ficm when i pulled cover off but my cts shows 47.5 and 48

[Jacup84]

My truck was running fine when i took it apart besides the bad oil cooler and head gaskets... pulling my hair out with this thing

[southend]

Those ficm plugs must "click" in. Pull them, check for a bent pin, or one that may have been pushed out of the plug. It happens.

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[Jacup84]

I checked pins all straight i will check plugs.. how can i read the 48v with a multimeter just to male sure im doing it correctly