Countryside Cafe

Is there a preferred method for installing wiring from fuse box to elctric choke? Any existing access through firewall??

MelWff

You didn't list year in your profile or post but see if you have a spot in the fuse box that has a spade marked IGN. I used that with an inline fuse and ran it through an existing grommet in the firewall that you can see under the dashboard.

Bikespace

GM used a relay in my 80, on a 20 Amp fuse. Best practice would be to do something similar. The relay can live under the hood, and be fed from the alternator (with a fuse), but I'd be wary of pulling too much from your fuse panel.

MelWff

A typical Holley electric choke uses a 10 Amp fuse and actual tests of amperage draw saw no more than 7 initially after which it dropped to about 2.

Bikespace

Your numbers align with what I saw. I suspect GM picked their 20 Amp fuse to be conservative on cold days.

Still, there is a relay, not a direct connection.

Richard454

As far as sizing a fuse-

The fuse is just there to blow before the wire melts- not to protect the devise connected.
So you'll want to match the wire to handle to current draw of the devise and the fuse to protect the wire.
And it's not an issue to use a smaller fuse and bigger wire- but not vise versa

Also- don't use the "primary" wire sold at autoparts stores- it's only rated at 180º
You'll want to use a cross poly link type wire rated for 256º - SXL-GXL-TXL

SXL = Standard

The thickest insulation of the three, SXL is good for high-temp spaces like engine compartments where space is less of a concern

GXL = Thin

This is generally used in high temp spaces where flexibility and reliability are needed. While it is thin walled, there is a thinner option.

TXL = Extra Thin

TXL is the thinnest option, making it ideal when space is at a premium. Extra thin wall also makes it lighter than the others.
Fuse /wire chart

bmotojoe

I usually purchase the GXL...
The TXL will save you space when bundling...
For Comparison, both are 14 gauge

1860army

I did not go to the fuse box, I grabbed power from the wiper motor plug, it's switched with the ignition, I rarely drive in the rain, the wipers are never on when I start the car, inline fuse and good to go...

60

CanadaGrant

I did the same as 1860 above when installing an electric choke conversion on my 69. I spliced into the yellow wire on the wiper motor plug which is keyed on with the ignition. I didn't use an inline fuse as the wiper plug is already fused. I tried a test initially with the wiper switch on at startup and everything worked normally. I've had it like that for over 5 years and never a fuse problem.

Countryside Cafe

Mel,

Thx for reply, I found that IGN port. Does it take a single connector plug of some sort? Looks different than the other two place fuse places.

MelWff

it takes a spade connector available at any auto parts store.

Countryside Cafe

Thank you, I probably have male spade connectors.

Countryside Cafe

Thank you, I am sold, and I will search for TXL wire, ro use.

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