Wiring switch into fan relay

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Feb 11, 2012 | 05:54 PM

THETANK

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Joined: Feb 2002

Posts: 369

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From: Ocean City, MD

Car: 91 rs

Engine: Carbed 355 CR 9:1 xr276 cam

Transmission: 700r4 2600 stall

Axle/Gears: 3.42

Wiring switch into fan relay

I want to wire a switch into my fan relay so I can manually turn the fan on yet still allow the switch in the block to automatically turn the fan on. From what I read in other posts I can hook the switch into the green wire on the fan relay to accomplish this.

1) What amp rating should the switch be?

2) do I need to run a fuse between the manual switch and the relay?

Thanks

Feb 11, 2012 | 06:20 PM

vetteoz

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From: Not in Kansas anymore

Car: 82 Z28

Engine: 383 SP EFI/ 4150 TB

Transmission: T400

Axle/Gears: QP 9" 3.73

Re: Wiring switch into fan relay

Quote:

Originally Posted by THETANK

I From what I read in other posts I can hook the switch into the green wire on the fan relay to accomplish this.

1) What amp rating should the switch be?

2) do I need to run a fuse between the manual switch and the relay?

Correct.
Splicing the manual switch into the wire ,grounds the relay to operate it the same way the ECM does.
Circuit is already fused with 3A fuse so 3A or better rated switch would work.
Is only the low current control side of relay