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Old 07-12-2007, 07:01 AM
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Doc, need relay help?

I have just installed a new kwik Wire harness and I used their relay for my electric fan. I used a toggle switch to activate. I have triple checked the wire routing and it is in accordance with the directions, but just as soon as I hit the switch it will blow the 25 amp fuse at the realy. Any suggestions?
Also, the wiring diagram shows only one #28 red wire going to the headlight switch. My buddy`s EZ Wiring diagram shows this #28 red wire spliced, and then attaches to the headlight switch in two places. I have no headlights, but do have tail lights. Should I splice and attach at two places? Thanx, Bob Myers.

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Old 07-12-2007, 06:00 PM
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Not Doc but it sounds to me like you have a fuse that is too small for an electric fan! I would think a minimum of a 30 amp and very possibly a 40 amp fuse.
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Old 07-12-2007, 06:02 PM
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Not sure of the size of your fan,
but my Spall twin 11" use two relays and two 30amp fuses
You may need a bigger fuse and/or relay
Twin fans should require 2 relays and fuses.

Give a few minutes and I will find my hl wiring diagram----also two places.

Battery power will go to------the headlight circuit ----AND----tail/park circuit

Bryan
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Old 07-12-2007, 06:07 PM
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Found it
This is for a GM headlight switch
The headlights should be circuit breaker protected inside the HLswitch
the park/tail lamps are fused at the box
this is why there are 2 feeds to the switch

Bryan
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Old 07-12-2007, 07:56 PM
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This is a very good site for relay wiring diagrams.

Vince
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Old 07-12-2007, 08:28 PM
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Doc here,

Bosch relay FOR FAN:
  • RELAY COIL #85 Coil power FUSED (1 a amp) switched source.

  • RELAY COIL # 86 = Manual switch or switch controller device.

  • RELAY TERMINAL CONTACT # 87 = 12 Volt power source VIA FUSE LINK or MAXI fuse 40 amp..on a 10 gauge wire.

  • RELAY TERMINAL CONTACT # 30 = Fan motor via 10 gauge wire.

  • RELAY TERMINAL CONTACT # 87A = IS NOT USED.


HEADLIGHTS:

The head lamp wires will not come off the dash switch, the low and high beam wires are located at the HI/LOW switch or relay...there is where your connections will be.

Doc
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Old 07-12-2007, 11:08 PM
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doc, need relay help?

Guys, Thanx for the replies. I found my problem.....I have two fans and two relays. The fans are from a Ford windstar van and the two individual hot wires to the fan motors were connected in the small fan harness. I set my relays to work 1 off a toggle, and 2 off the thermostat in the intake manifold. When I would flip the toggle switch for fan one, both fans would attempt to start and blow a 30 amp fuse. I separated the two wires and now my fans are fine, thanx again, Bob Myers.
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Old 07-13-2007, 03:37 AM
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Doc here,

Bob,

Be advised, standard fuses are not generally up to the task of spike handling of a cooling motor..

I always advocate a MAXI FUSE or FUSE LINK for the DC source line for these..wouldn't do to pop a fuse 150 miles into the Desert without a replacement..or have to change them every other drive..

Doc
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