| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,080 Posts1,056,060 Members48,433 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2005 Posts: 121 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2005 Posts: 121 | The heater motor ( new ) in my 66 when run on high will blow a 10A fuse within a few seconds. Checked the motor and it draws 2.5 amps when connected directly to the battery. The fuse box says 10a beside the fuse but also says " A/C 20A " with an arrow pointing at the same fuse. I put a 15 amp fuse in and it seems to be working ok but I don't want to take any chances.
Anybody know what amp fuse the truck should be using? Or am I OK with a 15 or even 20 amp fuse? Its got the deluxe heater but no A/C. Just got the truck back on the road- It wasn't driveable when we got it so no idea what might have been there before.
Last edited by dave64; 06/06/2009 4:59 AM.
Dave
66 GMC- father /son project with the "GMC KID"
36 Chevy PU- 4x4 lifetime project
64 Skylark- wife says its hers
| | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | I've found lots of bolts in place of fuses in old truck fuse panels, but if the motor says 2.5a I'd wanna go over the whole thing to find out why it'll blow a 10a .... could be a bad motor [even new] or a wire with melted insulation too close to a ground that's not quite shorting .... if it ain't right fix it  the "AC 20a" will likely be to allow for the compressor, otherwise 10a is what the engineers thought it should never exceed - actually more like 6-8 with a fudge factor Bill | | | | | Joined: Oct 2008 Posts: 321 'Bolter | | 'Bolter Joined: Oct 2008 Posts: 321 | I took a look at the wiring diagram and data for '63 and the book says 15a fuse for deluxe heaters and 10a for recirculating heaters. That is for '63 but I can't imagine it would have changed that much by '66. I also looked at the fuse box for my '63. It says the same thing on it, Heater 10a, A/C 20a. Keep in mind they used the same fuse box regardless of heater application. So, I would follow the book and use a 15a fuse with your deluxe heater.
1963 Chevy C20 Longbed Stepside
1978 Chevy K30 Custom Deluxe
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Put a 20-30 in it. If something is wrong it will blow.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Mar 2005 Posts: 121 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2005 Posts: 121 | I checked all the wiring and connections and don't see any problems. I couldn't find the fuse rating in my assembly manual so will go with the 63 info. Thanks for the replies.
Dave
66 GMC- father /son project with the "GMC KID"
36 Chevy PU- 4x4 lifetime project
64 Skylark- wife says its hers
| | | | | Joined: Mar 2005 Posts: 98 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 98 | 2.5A running might be 8A on startup
50 chevy 3100
| | |
|
|
| |
