ReeRee Posted October 4, 2022 Share Posted October 4, 2022 (edited) A/C compressor wasn't kicking on and I found fuse #18 blown. Replaced fuse and new one was immediately blown. Replaced the relay and it worked for a bit then started blowing the fuses again.Anybody had this issue before and what would be the next steps to trouble shooting the issue? Edited October 4, 2022 by ReeRee (see edit history) Link to comment Share on other sites More sharing options...
Barney Eaton Posted October 4, 2022 Share Posted October 4, 2022 Did the compressor ever kick in and did you have enough time to check pressures? 1 Link to comment Share on other sites More sharing options...
Ronnie Posted October 4, 2022 Share Posted October 4, 2022 1 hour ago, ReeRee said: A/C compressor wasn't kicking on and I found fuse #18 blown. Fuse #18, a 10 amp fuse, supplies 12 volts to the clutch on the A/C compressor. The clutch, or the wiring going to it, is likely shorted to ground causing the fuse to blow. That circuit goes though A/C relay J. You could try changing that first. 1 Link to comment Share on other sites More sharing options...
ReeRee Posted October 5, 2022 Author Share Posted October 5, 2022 Replaced j fuse. Worked for like 2 minutes then blew again. Checked lowside pressure when on showed just a hair over 40 psi. Link to comment Share on other sites More sharing options...
padgett Posted October 6, 2022 Share Posted October 6, 2022 Bit low, mine is about 70 psi with everything off on R134a. 1 Link to comment Share on other sites More sharing options...
Karlw144 Posted October 6, 2022 Share Posted October 6, 2022 40 psi is good with the ac running for 2 minutes. However, could also indicate a lower than normal charge. Still think you must have a wire shorted out, or bare somewhere so that it blows the fuse. 1 Link to comment Share on other sites More sharing options...
Ronnie Posted October 6, 2022 Share Posted October 6, 2022 On 10/4/2022 at 8:47 PM, ReeRee said: Replaced j fuse. "J" I referred to should be a relay that kicks in the compressor. If you changed that relay and fuse #18 is still blowing, the electric clutch that engages the compressor is about all that is left that would cause the fuse to blow unless you have a short in the wiring. 1 Link to comment Share on other sites More sharing options...
ReeRee Posted October 7, 2022 Author Share Posted October 7, 2022 My mistake I meant j relay from the box just behind the driver's headlights. Ran a 15amp fuse to make sure the compressor was still working correctly and check the pressures. The fifteen amp fuse hasn't popped tho and everything is working good when it is in. Got a multi meter and I intend to check all the wiring soon. Link to comment Share on other sites More sharing options...
Ronnie Posted October 7, 2022 Share Posted October 7, 2022 1 hour ago, ReeRee said: Ran a 15amp fuse to make sure the compressor was still working correctly and check the pressures. The fifteen amp fuse hasn't popped tho and everything is working good when it is in. Fuses are there to protect the wiring. Putting in a larger fuse may stop the fuse from blowing but you run the risk of melting wires. 2 Link to comment Share on other sites More sharing options...
padgett Posted October 7, 2022 Share Posted October 7, 2022 Except in the UK. Positive ground wiring was used to protect the Lucas fuses. 1 1 Link to comment Share on other sites More sharing options...
Ronnie Posted October 7, 2022 Share Posted October 7, 2022 2 hours ago, padgett said: Except in the UK. Positive ground wiring was used to protect the Lucas fuses. Some of the Brits I owned had positive earth. I think the fuses were an afterthought. I don't think the generators put out enough power to melt a wire. 1 Link to comment Share on other sites More sharing options...
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