Diesel Bombers - OPS relay mod with prime cycle

Diesel Bombers (https://www.dieselbombers.com/)

- Chevy/GMC 6.2L and 6.5L (https://www.dieselbombers.com/chevy-gmc-6-2l-6-5l/)

- - OPS relay mod with prime cycle (https://www.dieselbombers.com/chevy-gmc-6-2l-6-5l/119696-ops-relay-mod-prime-cycle.html)

racer55

03-07-2014 08:49 AM

OPS relay mod with prime cycle

1 Attachment(s)

It has been brought to my attention that there is a condition with the OPS relay mod I posted that can cause ECMB fuse to blow when cranking because of a backfeed to the glow plugs.

To remedy this here is a new diagram showing the factory relay and the mod relay with a diode installed to stop this condition.

Without the diode you could have a no start caused by the previous mod if installed as posted originally.

racer55

03-07-2014 11:22 AM

Note: this is for 95 and older trucks with electric lift pump.
example of a useable but overkill diode:
http://www.ebay.com/itm/GE-20-Amp-50-Volt-Stud-Mounted-Diode-Wind-and-Solar-Blocking-Diode-50V-20A-/271277867361?pt=LH_DefaultDomain_0&hash=item3f296bc161

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