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connor_warren59
Samba Member
Joined: March 05, 2010
Posts: 103
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 Posted: Thu Jul 22, 2021 10:59 am Post subject: Wiper fuse blows when ignition is turned on |
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So I have a problem that just surfaced out of nowhere. My wiper fuse (16a) blows when I turn my ignition switch on. I’ve got a 1982 Vanagon with an ej22 conversion. I replaced the fuse and the wipers/washer pump work fine when the key is in the off position, but the fuse immediately blows when I turn the ignition switch into the on position. I was looking at the wiring diagram and am not entirely sure where the culprit could lie. Maybe an issue with the load reduction relay shorting internally when the key is switched on?
Any ideas would be helpful!
Thank you! |
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skills@eurocarsplus
Samba Peckerhead
Joined: January 01, 2007
Posts: 16863
Location: sticksville, ct.
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| Posted: Thu Jul 22, 2021 11:02 am Post subject: Re: Wiper fuse blows when ignition is turned on |
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none of that should work with the key off. you have something bad going on there
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connor_warren59
Samba Member
Joined: March 05, 2010
Posts: 103
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| Posted: Thu Jul 22, 2021 11:34 am Post subject: Re: Wiper fuse blows when ignition is turned on |
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| Ok, I couldn’t remember if it was supposed to function with the key in the off position or not. Thanks for the clarification, definitely sounds like I’ve got something funky going on. |
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connor_warren59
Samba Member
Joined: March 05, 2010
Posts: 103
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| Posted: Thu Jul 22, 2021 12:29 pm Post subject: Re: Wiper fuse blows when ignition is turned on |
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| Ok, it seems like the current draw that is blowing the fuse is coming from my BA6 heater temp control switch to the right of the steering column on the dash (the green rotating switch). It’s never given me issues before and has always worked fine, but when switched on it immediately blows that 16a fuse. |
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Vanagon Nut
Samba Member
Joined: February 08, 2008
Posts: 10371
Location: Sunshine Coast B.C.
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| Posted: Fri Jul 23, 2021 11:17 am Post subject: Re: Wiper fuse blows when ignition is turned on |
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edited
| connor_warren59 wrote: |
| Ok, it seems like the current draw that is blowing the fuse is coming from my BA6 heater temp control switch to the right of the steering column on the dash (the green rotating switch). It’s never given me issues before and has always worked fine, but when switched on it immediately blows that 16a fuse. |
As you likely did, as a first step, inspect for an obvious thing like loose wire at dash. Maybe a positive wire at the gas heater controls at dash fell loose and is shorting to dash metal. Or, there's some wear inside one of those gas heater controls causing a short to ground.
P. 97.24 Bentley appears to show a hard wire (buss) connection on supply side between fuse S8 and S9 S23 for gas heater. i.e. that buss is an unfused positive supply to gas heater fuses. edited: that buss also connects to 30 of load reduction relay. 87 of that relay goes to the S10 16 Amp fuse
Remove gas heater fuses? See what happens?
end edit
I realize this issue just surfaced but to help rule out any engine conversion wiring funkiness.....
Did this Vanagon originally have an air cooled engine?
Neil.
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connor_warren59
Samba Member
Joined: March 05, 2010
Posts: 103
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| Posted: Thu Jan 13, 2022 3:15 pm Post subject: Re: Wiper fuse blows when ignition is turned on |
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Ok, just an update. The cause of the fuse blowing in that circuit was from the J10 heater safety switch. The plastic housing broke and the switch was flopping around and shorting against the bracket.
Does anyone have any idea where I could possibly find a replacement safety switch?
Edit: found a new one here https://www.busdepot.com/411963209b |
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32593
Location: Reading Pennsylvania
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AndyBees
Samba Member
Joined: January 31, 2008
Posts: 2329
Location: Southeast Kentucky
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| Posted: Fri Jan 14, 2022 5:54 am Post subject: Re: Wiper fuse blows when ignition is turned on |
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Looks like that Vacuum pipe might be putting stress on the switch.
I agree with Dave, repair the switch housing ......
JB Weld to the rescue !
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'84 Vanagon Tin-top, ALH TDI. 1989 Tin-top
1983 Air-cool, 225k miles, 180k miles mine. Seven trips to Alaska from 1986 thru 2003. |
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zoti
Samba Member
Joined: December 26, 2007
Posts: 2060
Location: Plano, TX USA
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| Posted: Fri Jan 14, 2022 6:35 pm Post subject: Re: Wiper fuse blows when ignition is turned on |
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| connor_warren59 wrote: |
Ok, just an update. The cause of the fuse blowing in that circuit was from the J10 heater safety switch. The plastic housing broke and the switch was flopping around and shorting against the bracket.
Does anyone have any idea where I could possibly find a replacement safety switch?
Edit: found a new one here https://www.busdepot.com/411963209b |
I just saw your post but as a general rule a blown fuse is always a short to ground before the load. In your case the switch is doing it. |
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