E-Fans SUCK!
Aug 9, 2010 | 10:03 AM
#33
That is good! Do you still have premature failures on the generic 30A bosch units? The diode should help the life of the contacts big time.
I haven't started gathering parts for my e-fan swap yet, it sounds worthwhile to snag the factory relays at the pick and pull though.
Aug 9, 2010 | 10:18 AM
#34
I built 4 for various people, basically used up all the parts I'd bought. Sorry I'm out of the harness business 
They are a pain to build.
I'd only had the newest harness in for about a year before I sold the truck. I pulled the relays a couple times and they were fine the times I checked them.
Picking up the factory relays and bases would be a good idea.
They are a pain to build. That is good! Do you still have premature failures on the generic 30A bosch units? The diode should help the life of the contacts big time.
I haven't started gathering parts for my e-fan swap yet, it sounds worthwhile to snag the factory relays at the pick and pull though.
I haven't started gathering parts for my e-fan swap yet, it sounds worthwhile to snag the factory relays at the pick and pull though.
Picking up the factory relays and bases would be a good idea.
Aug 22, 2010 | 05:57 AM
#37
K...so I put in the BlackBear harness yest and drove around for a while. Pretty simple install - the hardest part was getting the cover back on the PCM! Seems to be working great. I'll log some miles in the heat then pull the relays and see whats up.
Aug 22, 2010 | 10:08 AM
#38
I had issues with my original harness. Caught before it failed. I built my own. These things pull big amps and need big wires and good relays and bases.
Had the e-fans for about 3 years and they never failed to do their job.
I added diodes across the relay contacts on the harness I built. In the factory GM wiring schematic for the e-fans, the diodes are shown in the relays.
Had the e-fans for about 3 years and they never failed to do their job.
I added diodes across the relay contacts on the harness I built. In the factory GM wiring schematic for the e-fans, the diodes are shown in the relays.
Ive never burnt a relay or had a single problem with my LS1 efans or 05 fans.
I built a harness off that diagram using 10ga Hi-temp wire for the main wires and 14ga wire for the signal wires.
I also didnt use the AC Clutch as a "switch" it cycling off and on will do a number to a relay. Let your PCM control the fans, and put 2 override switchs in the cab.
This is the schematic you want to follow. I didn't understand it either, so I ordered one from EDO. He didn't include the fuse holders like I asked for, but I just added them myself. Once I had the harness in my hand, it was easy for me to look at the diagram and understand it. I've only had one relay failure, and it was because they were exposed to the weather. I now have them protected and no problems at all.
When these babies kick on high, they really move some air! Be sure to use the proper gauge wire.
When these babies kick on high, they really move some air! Be sure to use the proper gauge wire.
I didn't know EDO made fan harnesses too. I've been rockin the Blackbear for ~1 yr. I'm happpen w/. it.
I'm surprised nobody has built a harness that uses diode suppression...Turning off an inductive load like the fan is really hard on the contacts no matter what relay you use.
I guess the 'technical term' is a snubber, see this wiki link
http://en.wikipedia.org/wiki/Snubber#Diode_snubbers
I guess the 'technical term' is a snubber, see this wiki link
http://en.wikipedia.org/wiki/Snubber#Diode_snubbers
Last edited by fastnblu; Aug 22, 2010 at 10:14 AM.
Aug 22, 2010 | 11:04 AM
#39
My Nelson harness did great for about 3-4 years until the truck sat for 18 months and two relays smoked in succession...been rockin three new relays for the past few months with no problems. BUT, if I had to do it again, I'd go with the BlackBear harness as I have heard of very few problems with theirs if any. Seems like I'm one of the lucky ones who got their harness from Nelson before the QC went to ****...his relays have always been the cheapest off the shelf it seems though...
Aug 30, 2010 | 03:38 PM
#40
A buddy of mine just got a Nelson harness on his supercharged 1500HD. Been through about 7 relays now and it keeps messing up. He's supposed to call them and see whats up about replacing the harness. The relay sockets get really loose and start melting the plastic. Everything is wired right, and my OE fan harness worked with it just fine while testing it. Just givin a heads up, the nelson one has small wire and gets hot as hell.