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Natibug62 Samba Member
Joined: July 27, 2016 Posts: 2
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Posted: Wed Jul 27, 2016 5:11 pm Post subject: Main fuse blows when i turn on headlights on my 62 bug |
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Having trouble trying to find out what is causing my #1 fuse to blow every time I turn on my headlights. I have bypassed headlight switch and relay and it is still blowing. Fuse starts to get really hot then finally blows. Any thoughts? |
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flyboy161 Samba Member
Joined: December 26, 2009 Posts: 2091 Location: Perry, GA
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Natibug62 Samba Member
Joined: July 27, 2016 Posts: 2
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Posted: Wed Jul 27, 2016 7:44 pm Post subject: Re: Main fuse blows when i turn on headlights on my 62 bug |
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It just started out of the blue. The fuse I am referring to is the one on the far right where the power comes in. Turn signals work fine. With the car off I turn headlights switch on and I have headlights and taillights working but the fuse starts to get hot. I disconnected and by passed headlight switch and relay and still have the same problem. I even by passed the fuse and wire gets really hot. |
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 34013 Location: Conejo Valley, CA
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Posted: Wed Jul 27, 2016 8:04 pm Post subject: Re: Main fuse blows when i turn on headlights on my 62 bug |
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Post pics of the wiring connected to that fuse. It is likely miswired there or at the other end of one of the wires, causing a short.
Did this just start? What changed? Or is this a new car to you? |
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nlorntson Crazy VW Lady
Joined: March 13, 2004 Posts: 3783 Location: Twin Cities, MN
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Posted: Wed Jul 27, 2016 8:19 pm Post subject: Re: Main fuse blows when i turn on headlights on my 62 bug |
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Dimmer switch have issues? Is it grounded?
Is it your high or low beams or both? |
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 34013 Location: Conejo Valley, CA
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Posted: Wed Jul 27, 2016 8:27 pm Post subject: Re: Main fuse blows when i turn on headlights on my 62 bug |
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Headlight power should not pass through that fuse. Something is wired wrong. A great and common suggestion is to print the wiring diagram from the Technical section at kinkos poster size, and laminated. Then use a grease pencil or dry-erase marker to check off every wire and connector as you systematically check it all under the hood. There really is no shortcut. |
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flyboy161 Samba Member
Joined: December 26, 2009 Posts: 2091 Location: Perry, GA
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herbie1200 Samba Member
Joined: April 27, 2006 Posts: 833 Location: Rome - Italy
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Posted: Fri Jul 29, 2016 12:40 am Post subject: Re: Main fuse blows when i turn on headlights on my 62 bug |
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Natibug is referring to 1st fuse at the RIGHT, so it is the +30 (always on) fuse; 8A, only for interior light and radio.
I suppose the error is into relay main feed; he took it from the 8A fuse because he needs +30 always on for relays (bypassing main light switch).
I suggest, if a couple of relays are used, to feed relays with a main new cable directly from battery.
Weeks ago we discussed about a relay light conversion and someone posted a good schematic. |
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flyboy161 Samba Member
Joined: December 26, 2009 Posts: 2091 Location: Perry, GA
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caleb0101 Samba Member
Joined: August 26, 2014 Posts: 524 Location: Bristol Connecticut
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Posted: Fri Jul 29, 2016 9:17 am Post subject: Re: Main fuse blows when i turn on headlights on my 62 bug |
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try disconnecting the wire that goes to the parking lights. i had a similar problem on my 60 and it ended up being that the bulb holder was shorting out on the fender and blowing the fuse when i as i turned on the lights. _________________ Ruby red 1967 beetle sedan with a 2021cc
1967 beetle sedan baja project
April 60 euro spec ragtop beetle with a 1641cc |
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sludge20 Samba Member
Joined: May 30, 2016 Posts: 22 Location: Bellvue, Nebraska
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Posted: Fri Jul 29, 2016 12:33 pm Post subject: Re: Main fuse blows when i turn on headlights on my 62 bug |
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Just had this issue. Wiper the 6 volt wiper motor had an intermittent ground internally. (Note this is on a 12 volt conversion so I have some step down resistors and such to check out too.) Going to do an autopsy on it this weekend. Suspect it got wet and has some corrosion inside. |
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sludge20 Samba Member
Joined: May 30, 2016 Posts: 22 Location: Bellvue, Nebraska
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Posted: Tue Aug 02, 2016 8:50 am Post subject: Re: Main fuse blows when i turn on headlights on my 62 bug |
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Also take a look at the three connections on the high beam switch. One time I found one of mine had bent just a bit and would intermittently ground out when I shifted. (big feet). I put new shielded blade terminals and a bit of extra hot shrink on them and this issue was solved. |
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Bugman1970 Samba Member
Joined: June 20, 2016 Posts: 6 Location: Florida
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Posted: Thu Aug 04, 2016 7:32 am Post subject: Re: Main fuse blows when i turn on headlights on my 62 bug |
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Unless you have a multimeter to track down the problem, you will have to use trial and error to find it. You'll need a good supply of fuses. Disconnect the low beam wires at fuse block first and turn on the headlights. If the problem persists disconnect the high beam wires and press the dimmer switch a few times. If the problem still persists you have eliminated the headlights as the problem. Leave the headlight wires disconnected for now. Next, do the tail lights. If the problem still persists with both the taillights and headlights disconnected you have eliminated those circuits. The problem is either in the switch or in the main power wire coming from the switch to the fuse block. There is either a short in the switch or the main wire is shorting out somewhere and needs to be replaced. If you have an unfused wire getting hot there is a source of resistance ( short) on that circuit. Don't give up..you'll find the problem and it will probably be something simple. Good luck.
Dennis |
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