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Old 11-09-2015, 10:23 AM   #1
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Year: 1981
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1981 International S1853 electrical issue

I am looking for a wiring diagram for a 1981 International S1853 to determine which running lights are controlled by the headlight switch. Every time I turn on the running lights from the headlight switch I blow a 15amp fuse. Also the turn signals and hazards do not work anymore. I replaced the flasher relay but that did not fix the turn signal problem. Any ideas? Thanks for the help.
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Old 11-09-2015, 11:28 AM   #2
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Sounds like you have a short somewhere.
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Old 11-09-2015, 08:54 PM   #3
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Look at the connections for your front turn signals--they can become a mess.

Do you blow a fuse with just the park lights on and no headlights (the first stop on your headlight pull-switch), or do you need to pull it all the way out and have the headlights on for it to blow?

If it only blows when the headlights come on, the check the headlight paths/connection.

It sounds like, however, that it blows the fuse in the first position, in which case I would start at the front turn signals as they also contain bulbs for the running/park lights.

Next, check the rear tail lights and turn signals. If you're lucky, your short will be somewhere easy to get to when you pull those tail lights off.

It sounds like you may have some wires melted Ill pray to the bus gods for you
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Old 11-10-2015, 10:14 AM   #4
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It blows the fuse in the first position.

When I got the bus it had no head light switch. I did check the turn signals and they did work as well as brake lights. I noticed the fuse box was missing a few fuses. I put new fuses in and a new headlight switch. From there I burned up a fuse in the first position and then the turn signals quit working.

I will take loose the connecters for the turn signals and start tracking down the short.

Thanks for the advice!
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Old 11-11-2015, 04:34 PM   #5
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Update: Issue with running lights has been found and was bad connections in the front signal lights. I no longer burn the 15 amp fuse and the running lights work.

I put new headlights in but still do not work. Is there a relay for the headlights?

Turn signals still don't work. I think it may be the turn signal switch since when I jiggle the switch it will flash once then stop.

I found the batteries were low around 11.0 volts and turns out the alternator is bad so waiting for new alternator to arrive. Would the low voltage have any affect on the turn signals or headlights not working?

Thanks
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