Jump to content
  • When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

AC Compressor Wire Gauge

Recommended Posts

I have installed a new AC system in my 1974, including a Sanden AC compressor/clutch and a 12" x 14" parallel flow condenser and had a few questions.


1. What gauge wire should I run to from the AC compressor/clutch to the on-off switch in the console? The lead from the AC compressor/clutch looks to be 14 gauge.

2. Where is the best place to tap off power?

3. What amp fuse is needed?

4. Should I add an inline fuse or rely on the fuse box?



Link to comment
Share on other sites

I'm a great believer in "the wire can't be too large"--within reason, of course.  The thicker the wire, the less resistance.  And the price of 12 gauge vs 14 gauge wire is negligible.  


You need a 16 amp fuse just to be on the safe side, and if you're installing a Behr unit, it's wired so that you can't turn on the heater blower at the same time as the A/C is on.  I believe that wiring a Behr unit instructs you to wire it through the heater wiring (you should find a Behr diagram somewhere here on the FAQ).


If it's Frigiking, it's not wired that way, but taking a tap off the 16 amp fuse that serves the heater would work OK; most Frigikings I've seen are wired thusly.  It's only live when the ignition is on (which you want)--and I've had both my heater blower and A/C on at the same time, and it didn't blow a fuse, so the circuit can apparently handle both.  


Clardy suggests using an in-line fuse, but doesn't specify where to take the power from.  You'll need to tap into a circuit that's only live when the ignition is on; if it were mine, I'd use the heater blower circuit, same as Frigiking.  Don't use the lighter fuse, as it's hot all the time.


Hope that helps.



  • Like 2

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Upcoming Events

  • Supporting Vendors

  • Create New...