My Nelson fan harness is eating relays
07-12-2006, 04:49 PM
#1
My Nelson fan harness is eating relays
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?
07-12-2006, 04:57 PM
#3
Originally Posted by Yelo
Low voltage can burn out a relay irather fast.....even if you're below the amp rating for the relay
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.
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07-12-2006, 06:26 PM
#8
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.
07-13-2006, 01:56 PM
#9
Originally Posted by budhayes3
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.
07-13-2006, 02:53 PM
#10
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Originally Posted by thunder550
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.