510 Headlight Wiring
Datsun 510 uses headlights that are always hot, but not connected to ground until the Lighting Switch is pulled.
510 Switched-Earth Wiring
Headlights are not permanently grounded as in newer Datsuns Headlights are permanently connected to HOT via the Fuse Box
Original 1968-1969 6-fuse fuse box One fuse powers both Headlights
1969-1973 Dual-Fuse Headlight Circuit]
File:510 headlamp wiring late.jpg
New for 1969 8-fuse modular fuse box 'HL' 10A RL Power to Left Headlights 'HR' 10A R Power to Right Headlights
Relay switches ground on for either * High beams (all 4 lights) * Low beams (2 outer lights) Relay does not switch the 12V HOT side Relay switches the GROUND wires Relay Coil is powered by GL wire from Lighting Switch Relay Coil is switched by BR wire from Dimmer Switch * ungrounded = Low beams switched to Ground * grounded = High beams switched to Ground
Dimmer Switch * Only connects to Ground (High beam position) or disconnected * No 12V runs through it
Lighting Switch * controls headlights, park lights, dash illumination lights * does not control turn signals * does not control dash pilot lights (OIL, CHG, P.B)
Dash Illumination Lamps (2) are grounded though Pin 2 Black wire. GW Pin 1 goes to Lighting Switch
OIL pilot lamp is grounded via Oil Pressure switch G Pin 8 goes to 4-way Flasher Switch
CHG pilot lamp is grounded via Voltage Regulator G Pin 8 goes to 4-way Flasher Switch
Parking Brake pilot lamp is grounded via Handbrake switch G Pin 8 goes to 4-way Flasher Switch
Relay
25230-89915 RELAY ASSY-low beam lighting type K2 * S30 ignition/fuel pump RELAY B * replaced by B5230-89985
25230-89905 JIDECO RELAY COMP-lighting type K5
25230-89905
25230-89915
The two relays on the back side of the RH strut tower in front of the fuse box are for the headlights and the horn. The headlight relay has a 6 prong plug, the horn has four individual wires.
Relay is on the RH side behind the headlights
Original JIDECO relay
File:P4040356 zpsd9c1d13a.jpg File:P3300343 zpsf8d20b06.jpg File:P3300345 zps78460418.jpg File:P3300347 zps2f150968.jpg File:P3300349 zpsa539b5ca.jpg
Low Beam Relay B5230-28000
3-wire horn relay
[File:6729431907 92d9e3737e.jpg
Headlight Relay B5230-89985
Alternate Relays
You can use many different relays if you jump the wires from the harness to the relay pins. For example Nissan 25230-C9900 is only $2 at Pick-n-pull and used by hundreds of Nissan. Or $10 new at RockAuto.com.
25230-C9900/25230-C9905/25230-C9907 25A 25230-W1300 25230-C9963
Jumpers Relay Harness D com B body ground (leave one B wire disconnected) A NC RB low beam ground B NO RW high beam ground C coil GL light switch + E coil BR dimmer switch ground
Relay Repair
http://www.510coop.com/completed/HLrelay.htm
Carefully pry the cover loose. there are four crimps, one on each side. uncrimp carefully with a screwdriver and remove the cover. Now between the contact on the bottom of the plastic piece is a screw. Remove it and carefully lift the guts away from the base and you should see rust on the bottom. Sand that clean apply so dielectric grease, reassemble and you should have a working relay. It's the rust and corrosion that is interrupting the circuit. Be careful of the wiring in the relay. The unit itself is pretty tough but some of those fine wires can break if you get too rough.
So, that's what I did...and now I have headlights! Thanks Bruce!
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