converted_to_datsun Posted July 2, 2012 Report Share Posted July 2, 2012 I'm having Wireing issues lately. Just yesterday I looked out my window at my house and saw a little smoke comming from my truck then as I walked over a ton of smoke. When I popped the hood I found one of my horns burned up because of a short caused by a split wire rubbing on a bracket. And before that my headlights quit working and it looks like the wires have been getting a little too hot in a sketchy connector someone rigged up Does it sound like something as simple as old wires or am I having a more serious problem? Quote Link to comment
I'm BLUE Posted July 2, 2012 Report Share Posted July 2, 2012 I am not sure as I dont own a 620 but that doesn't sound right unless key was in "on" position or a bad relay? Idk Replace any (+) wires/bare connections that maybe in the same predictament. Make sure to execute hot solder joints and heat shrink wrap/electrical tape/liquid electrical tape Quality wiring connectors will work ok if you can't/don't solder Quote Link to comment
ggzilla Posted July 2, 2012 Report Share Posted July 2, 2012 Sounds like your 620 might be missing the Fusible Link. It is what prevents fires when a short like that happens. Quote Link to comment
68Datsun510 Posted July 2, 2012 Report Share Posted July 2, 2012 Sounds like 30 years of wiring hacks thinking they are electricians... You may need a new engine harness :/ Quote Link to comment
converted_to_datsun Posted July 2, 2012 Author Report Share Posted July 2, 2012 The horn gets constant power cause you can honk when the key is off and the fuse did blow after a bit but I think it was too hight amp might be why is got melted so much. Might be right about the Barnes but I hope not.... I'm not an electrician so I'd rather fix what I have I guess I dunno at this point Quote Link to comment
68Datsun510 Posted July 2, 2012 Report Share Posted July 2, 2012 The horn switch gets constant power, but you shouldnt have voltage AT the horn unless your actually honking... Quote Link to comment
converted_to_datsun Posted July 2, 2012 Author Report Share Posted July 2, 2012 Yea it makes no sense but the horn wasn't blowing when it shorted so I have no clue how there was power to melt it. For now it's unplugged and taped off the melted wires. I Quote Link to comment
ggzilla Posted July 2, 2012 Report Share Posted July 2, 2012 The horn on my Datsuns has constant power through the Fusible Link, but no ground until you press the button. Quote Link to comment
68Datsun510 Posted July 2, 2012 Report Share Posted July 2, 2012 Wow, thats odd... On 510s the horns ground thru the body. Quote Link to comment
datzenmike Posted July 2, 2012 Report Share Posted July 2, 2012 You're forgetting the horn relay. There is battery power through the horn relay coil then to the steering wheel horn button and to ground when pushed. When energized, the relay connects power to the horn which is grounded. Quote Link to comment
68Datsun510 Posted July 2, 2012 Report Share Posted July 2, 2012 I was only referring to the horn itself, after the relay. Quote Link to comment
pharouh Posted July 2, 2012 Report Share Posted July 2, 2012 Time to do some serious wire tracing. Do you have a factory service manual? Could a bad ground do that? Check for bare wires,wires twisted together,and anything that doesn't look 'right'. And see if the fuses have the right rating. Quote Link to comment
ggzilla Posted July 2, 2012 Report Share Posted July 2, 2012 yes, like mike says, I was referring to the horn relay. It's hot all the time, and then sends 12V to the horns when the button is pressed. It's very close to the horn. Quote Link to comment
the nice machine Posted July 2, 2012 Report Share Posted July 2, 2012 well, here is the wiring diagram for the 1979. mine is a '79 too, and i spent the first few months fighting electrical problems. it is the most complex wiring of all of the 620's. the good news is, you are about to get good at dealing with wires. Quote Link to comment
ggzilla Posted July 2, 2012 Report Share Posted July 2, 2012 First thing check your Fusible Link. It's on the battery cable, in the wiring diagram. Quote Link to comment
the nice machine Posted July 2, 2012 Report Share Posted July 2, 2012 oh man reading this thread is bringing back some bad memories. as far as your headlight problem goes, i don't think this could make the connector hot, BUT... most of the electrical problems in my 620 were because of the turn signal assembly. your headlights, horn, turn signals and brake lights run through it. the turn signal assembly on a '79 is mostly made of plastic, it is old now so it is brittle and little bits chip off. on mine the headlights only worked sometimes, turn signals only worked sometimes, etc. i rebuilt it and it worked but a month later more brittle plastic chipped off and everything stopped working again. maybe the problem is in there somewhere. sorry to add to the confusion, but that is my two cents. Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.