Docsis510 Posted July 11, 2011 Report Share Posted July 11, 2011 I have a 72 510 with a fresh ka24de motor swap. One of my turn signals stop working so I decided to check my wiring. I was checking to fuse box and noticed that the white wire that comes out the fuse box into the harness gets very hot. I unplugged it and its hot from the wiring harness side. Do I need a bigger wire? Is there something wired wrong causing the wire to get hot?? Im scared this can cause a fire. Thanks. Quote Link to comment
datzenmike Posted July 11, 2011 Report Share Posted July 11, 2011 That is likely the main power wire in from the battery. Don't worry it has a fusible link in line to protect it. Do you have anything wired into the 510 electrical system like an amp, stereo, CB., alarm, fog lights etc??? other than what came on the car???? Signals: If one side works then the signal circuit is likely fine and one of the bulbs has blown out. Quote Link to comment
Docsis510 Posted July 11, 2011 Author Report Share Posted July 11, 2011 I dont have any thing hooked up. but if u say dont worry I wont. The turn signal works when the headlights are off but when I turn them on the signal stops working. Quote Link to comment
mike Posted July 11, 2011 Report Share Posted July 11, 2011 How do all your connections and fuse block look? If theyre corroded/loose/dirty soak them in vinegar or lemon juice and VERY LIGHTLY bend the tabs a little tighter on the fuse block... Then check your wiring, make sure all your connections/plugs are tight, a loose connection can cause resistance/heat. If it does get burning hot, keep some thick leather gloves and yank your Positive battery cable ASAP, before you try to put a fire out. Quote Link to comment
datzenmike Posted July 11, 2011 Report Share Posted July 11, 2011 Well it shouldn't hurt but if very hot that is worrisome. Is it hot with all the lights off and just the engine idling? Was thinking that if you have a KA swap you must have an electric fuel pump added. Quote Link to comment
ggzilla Posted July 12, 2011 Report Share Posted July 12, 2011 EFI swaps should have the Fuel pump, injectors and ECU all wired outside the stock fuse box. Using relays and fuses. Because the stock fuse box wasn't designed for constant high loads. It might be rated for 20A, but doesn't do too well in practice. Newer Datsuns have the fuse boxes wired directly to the harness (no spade or rectangular connectors for the fuse box). That eliminates the troubleshoot connection problems. Quote Link to comment
Docsis510 Posted July 12, 2011 Author Report Share Posted July 12, 2011 yes i have 3 relays wired seperate for the ka. i do have one cable wired from the starter/main batt cable to the fusebox for my relays. could i have the alternator wired wrong?? it charges good though. Quote Link to comment
thisismatt Posted July 12, 2011 Report Share Posted July 12, 2011 If a wire is hot, or even warm from electrical load, then you have a problem. Either your wire gauge is too small for the load you're trying to carry, or something is malfunctioning and drawing too much. Quote Link to comment
ggzilla Posted July 12, 2011 Report Share Posted July 12, 2011 i do have one cable wired from the starter/main batt cable to the fusebox for my relays The IGN signal to activate the relays come through the fusebox. But the main power for the relays should not come from the fusebox. You can start tracing the load on the white wire. Use an ohmmeter to measure the load. Quote Link to comment
gorillabear Posted July 12, 2011 Report Share Posted July 12, 2011 Do you have your brights on? Try turning them off and see if that helps. Quote Link to comment
josh817 Posted July 12, 2011 Report Share Posted July 12, 2011 How do all your connections and fuse block look? If theyre corroded/loose/dirty soak them in vinegar or lemon juice and VERY LIGHTLY bend the tabs a little tighter on the fuse block... Then check your wiring, make sure all your connections/plugs are tight, a loose connection can cause resistance/heat. If it does get burning hot, keep some thick leather gloves and yank your Positive battery cable ASAP, before you try to put a fire out. I was thinking the same. Maybe your running lights are have corroded grounds. They should ground through the light socket I think. My Z had this problem and the fuse block got so hot it melted the terminals. Quote Link to comment
banzai510(hainz) Posted July 12, 2011 Report Share Posted July 12, 2011 the white wire shouldnt be hot as your new harness is using another circut via batter slash the relays. white wire will be lights wipers and ect as the white wire feeds the fuse box. and now yours really running less unless you got H4 100watt lamp running all the time but that should be on a relay to batt also. I think what GGZilla is saying is correct unless they is a high resisiant short on the white wire line some where. Quote Link to comment
Docsis510 Posted July 13, 2011 Author Report Share Posted July 13, 2011 I was working on the car today and noticed that the white stays warm but when I turn the head lights on it gets very hot.. Also the turn signals stop working when the lights are on but when I shut them off they work again. I also noticed that a little connecter piece came of one of the low beams. Quote Link to comment
ggzilla Posted July 13, 2011 Report Share Posted July 13, 2011 Use your ohmmeter. How much ohms are pulled through the fuse when the headlights are on? My white wire gets very warm/slightly hot also. Turn signals and headlights have separate fuses and separate circuits. But the white wire (at least on a 620 or B110) is the FEED for both fuses: Quote Link to comment
banzai510(hainz) Posted July 13, 2011 Report Share Posted July 13, 2011 Docsis510 I would get a H4 harness and that would Help take power off the white feed wire also. as it hooks up to the battery via the starter lug and usues a relay. Quote Link to comment
Docsis510 Posted July 15, 2011 Author Report Share Posted July 15, 2011 I found the problems. I have dual fans hooked up sstraight to the black and white wire. So the fans were sucking to much power. So when I turn the headlights on both the lights and fans suck alot of power and cause my turn signals not to work. I need another way to hook the fans up Quote Link to comment
datzenmike Posted July 15, 2011 Report Share Posted July 15, 2011 .... Do you have anything wired into the 510 electrical system like an amp, stereo, CB., alarm, fog lights etc??? other than what came on the car????.... .... and cooling fans??? Quote Link to comment
thisismatt Posted July 15, 2011 Report Share Posted July 15, 2011 I found the problems. I have dual fans hooked up sstraight to the black and white wire. So the fans were sucking to much power. So when I turn the headlights on both the lights and fans suck alot of power and cause my turn signals not to work. I need another way to hook the fans up Duuuur-ectly to the battery via relay switched fused/fusible link connection. Quote Link to comment
ggzilla Posted July 15, 2011 Report Share Posted July 15, 2011 Yep go the wreckers and get this genuine Nissan relay, super reliable marked A,B,C,D,E on the case. Put a 20A fuse right at the battery, then a wire to the relay #B. Connect relay #D to the fan. Relay E to ground, and relay C to the thermo switch. C and E can be relatively thin wires, but D & B need to be as large as the fan wire. Quote Link to comment
ppeters914 Posted July 16, 2011 Report Share Posted July 16, 2011 Yep go the wreckers and get this genuine Nissan relay, super reliable marked A,B,C,D,E on the case. Put a 20A fuse right at the battery, then a wire to the relay #B. Connect relay #D to the fan. Relay E to ground, and relay C to the thermo switch. C and E can be relatively thin wires, but D & B need to be as large as the fan wire. Hmmmm....I bet I need to do that. What vehicles/years? And where are those relays....engine compartment? Quote Link to comment
ggzilla Posted July 16, 2011 Report Share Posted July 16, 2011 Nissan circa 1980 to 2000 under the hood mostly. At pick-n-pull just walk down the row and you'll see them They are usually blue, green or black. $2 at pick n pull, or $10 at Nissan. Quote Link to comment
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