gene knight Posted December 12, 2016 Report Share Posted December 12, 2016 maybe voltage regulator bad 1 Quote Link to comment
Charlie69 Posted December 12, 2016 Report Share Posted December 12, 2016 Mark I worked on the wiring a little more, Not enough to send you an update. I have to see the dentist today and have a few teeth pulled. After I get home I hope to work on the diagram some more. Quote Link to comment
Charlie69 Posted December 12, 2016 Report Share Posted December 12, 2016 He has bi-passed the voltage regulator. He has an internally regulated alternator now. Quote Link to comment
wayno Posted December 13, 2016 Report Share Posted December 13, 2016 Internally regulated alternators are easy to wire, one wire goes to the dash light, one goes to a keyed power source on the fuse block, the big output wire goes to the positive side of he battery or the main power lug on the starter, and a ground wire going from the alternator to the frame/body, it's easy and you trash all that stock wiring except the dash light wire and maybe the keyed hot exciter wire, but I made my own one of them for my 521. 1 Quote Link to comment
Charlie69 Posted December 21, 2016 Report Share Posted December 21, 2016 Thank you Wayno I beleive that explanation helped him. Mark and I talked tonight and he is making headway on this wirirng problem and is working on it as time permits. The truck starts and runs and the lights work. turn signals work front, back, left, and right except the indicators on the dash. Flashers do not work. Not sure if heater works. He has eliminated the cigarrete lighter, the radio, and the dome light as it is a removable hard top.the tail lights are currently powered by a jumper wire on the late model 620 light switch. I need to compare both light switches and the the wiring diagrams to figure out why the tail lights had to be jumpered to work. could be as easy as installing the correct early switch. We will see. We will concure this wiring be asured. Quote Link to comment
Pacific coast Datsun Posted December 27, 2016 Author Report Share Posted December 27, 2016 Ok with Charlies & Waynos help I've almost got the fuse block rewired correctly. The Alternator plug is correctly wired & all wires are sorted & back in the wire loom in the engine bay. My last hurdle is my light switch that's out of a newer 620 & on the back of it...at the time I installed it years ago I had to "jumper" two of the connectors to get the taillights to work. I think at this point if I remove the jumper wire & run a new wire from the Park/Tail fuse to the light switch that may solve the issue of ALL my lights running of the one fuse. 2 Quote Link to comment
Pacific coast Datsun Posted January 9, 2017 Author Report Share Posted January 9, 2017 Ok finally a few pics... The simplified & corrected version of the wiring harness & alternator plug. Fuel return line installed to eliminate vapor locking & heat shield made to attempt to keep the fuel line from getting hot... New [used] L 18 swapped in..runs very smooth...smokes a little... & i have oil leaking from exhaust port #1 off & on. I have new valve seals [TY Charlie] that should correct that issue. With the fuel return line now installed I had to switch the fuel intake port on the Weber to the other side / make a heat shield... & the almost done rewired fuse block. A HUGE TY to Charlie for helping me out on this process... & a few randoms... 3 Quote Link to comment
Charlie69 Posted January 10, 2017 Report Share Posted January 10, 2017 Excellent Mark!!! Redeye will be happy he has pictures to look at!!! LOL I will get out in the garage in the morning and see what I have from Gene on the wiring harness from the 72 620. I will get what I have boxed up and shipped to you ASAP. 2 Quote Link to comment
gene knight Posted January 10, 2017 Report Share Posted January 10, 2017 So what about me? 1 Quote Link to comment
Charlie69 Posted January 10, 2017 Report Share Posted January 10, 2017 What do you mean Gene? Quote Link to comment
Pacific coast Datsun Posted January 12, 2017 Author Report Share Posted January 12, 2017 TY Charlie. I think all ill need is the dimmer switch & the ignition switch as a backup. I got my signals to work by using a new flasher...then after cleaning & greasing the signal switch they stopped working haha. I also have hazzard lights again & re mounted the fuse block. 1 Quote Link to comment
gene knight Posted January 13, 2017 Report Share Posted January 13, 2017 Wrong grease used 1 Quote Link to comment
Charlie69 Posted January 13, 2017 Report Share Posted January 13, 2017 I am going to box up everything for the 72 620 and through in a 720 dimmer switch and ship it to you. This way if you have trouble down the road you should be covered. Good work on the wiring problems Mark. You are starting to see how 1 small wiring problem snowballs into more problems. Quote Link to comment
Pacific coast Datsun Posted January 14, 2017 Author Report Share Posted January 14, 2017 Your right Gene...I have to remove the grease & use dialectic grease. Thanks Charlie & yes I have learned alot about the wiring in my truck & wonder how it even worked before haha 1 Quote Link to comment
Pacific coast Datsun Posted January 21, 2017 Author Report Share Posted January 21, 2017 Ok...I have signals again & in the process the collum cover finally broke where the screws go into. So...I decided to use some bamboo to cover the collum & I made a metal box to hold the ignition. Pics soon... 3 Quote Link to comment
]2eDeYe Posted February 13, 2017 Report Share Posted February 13, 2017 Yay, some pictures! :lol: Looking good, nice to see some progress. 1 Quote Link to comment
Pacific coast Datsun Posted March 24, 2017 Author Report Share Posted March 24, 2017 Allright here we go...again. A few weeks back i replaced the valve seals on #1 cylinder with the head on. Following Charlie's advice i jammed clothesline into the spark plug hole to keep the valves "up" & using a spring compressor i easily swapped out the seals. I still have a bit of oil leaking onto the heat shield i made...i suspect its the valve cover gasket. I took it for a drive last month & all the lights & signals were working just fine...i met some friends for dinner & came out to go home only to discover that I had NO power going to anything. We towed it home with a tow strap & there shes been sitting. I need to undo the zip ties & wire loom & look for a shorted wire im hoping its not hard to locate. I swear this truck fights me EVERY step of the way !! 3 Quote Link to comment
gene knight Posted March 24, 2017 Report Share Posted March 24, 2017 pcd: hit me up 1 Quote Link to comment
]2eDeYe Posted March 24, 2017 Report Share Posted March 24, 2017 It's always something once you start messing with them :lol: 1 Quote Link to comment
Lockleaf Posted March 25, 2017 Report Share Posted March 25, 2017 No power anywhere sounds like main fuse or fusible link issue if not a connection issue. 1 Quote Link to comment
tdaaj Posted March 27, 2017 Report Share Posted March 27, 2017 Damn i was just down there, coulda swung by and helped yoh out 1 Quote Link to comment
Pacific coast Datsun Posted March 29, 2017 Author Report Share Posted March 29, 2017 Thanks guys I'm sure itll be an easy fix I just need some free time to get to it. 1 Quote Link to comment
Charlie69 Posted April 10, 2017 Report Share Posted April 10, 2017 Mark I will fix the wiring on your 620. Bring the truck down to me and I will work on it. Bring the looms gene dropped off also. Quote Link to comment
Pacific coast Datsun Posted October 15, 2017 Author Report Share Posted October 15, 2017 Ok long time with no updates. The truck sat all summer due to work being insanely busy & me sleeping 5 hours a day for 4 months. The issue ended up being a bad fuseable link connection...easy fix to say the least. Its got current tags again & i drove it to work the other day ...46 mile round trip. The motor smokes more than i thought it would & is using oil at a not healthy rate but for short cruises it'll be ok for now. It runs very smooth & still has decent power & the engine temp never got above 170. I need to readjust the valves & replace the rest of the valve seals & maybe put an additive in the oil to see if thatll cut down on some of the smoke. & for some reason now my hood wont latch where it did before...Oh well i can go back to the hood pins if i have too. 2 Quote Link to comment
gene knight Posted October 15, 2017 Report Share Posted October 15, 2017 Glad 2 c u working on it again 3 Quote Link to comment
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