It's the relay that triggers both fans on high. One fan on high works fine, both fans on low works fine, but the relay that controls both fans on high keeps blowing. I had the original 40 amp one that came with it, lasted quite awhile then blew, I replaced it with a 30 amp since it was all I could find, it lasted about a week then blew, then I replaced it again with a 40 amp from Napa, lasted about 3 weeks, now that one is toast too. Anybody have an idea what's going on?

 

Low voltage can burn out a relay irather fast.....even if you're below the amp rating for the relay

 

I just installed my second alternator and battery, and right now the ONLY thing running off of it are the e-fans, and it's a 145 amp alternator. I'll double-check voltages, but I think they are fine.

I just talked to Allen on the phone and he told me to try and clean the contacts, and he is going to send me a couple of new relays as well, thinking that maybe the ones he supplies are stronger than the one I got at Napa.

 

how are your engine/chassis ground straps?

 

Good, I did the big-3 upgrade awhile ago. The engine straps are fine, and I put an additional 0-gauge engine-to-chassis ground wire in.

 

Did that 0 gauge ground wire help?

 

I dunno, I just did it as part of the big-3 upgrade, which happened at the same time as the rest of the stereo install, so I don't really have anything to compare it to.

 

You could try putting an ammeter in series with the circuit and checking what kind of current is flowing in that circuit...or you may be experiencing a voltage spike when the fans kick on high which is burning the relays. If that's the case, a relay with a "clamping" diode in it may help.

 

I may try the clamping diode, but I decided it's all coming out anyway and I'm going back to a clutch fan. The e-fans aren't working well in the summer here in traffic when I have the a/c on, and are horrible for towing.

 

Mine kick ***. Maybe it's your settings, not the fans. I also tow nearly every weekend.