If the BlkWire that Marc spoke of has 12v then check that the 2 relays in the BlkBox above the Coil are Switching ~ Have an assist' turn the Igni'Key while you ListenTo or Touch those relays ~ 1 Powers the ECU & the other Powers the FuelPump ~ They are Cheap ~ All Vanagons should have a Spare 1 or 2 of those OnBoard ~ Also in regards to BadBatt' ~ I have had a Batt' with a ShortedCell so it still had the Ability to Crank the Starter QuiteNicely but there was not EnoughJuice to make the ECU Happy ~ ORR ~ DeanB
On 25 Sep , 2015, at 7:20 AM, Marc Perdue wrote: > If the van had alternator problems, i.e., the alternator died and the > van ran till the battery ran out of juice, it could have killed the > battery. Why not start at the beginning and see if the battery's good? > > Marc > > On Thu, Sep 24, 2015 at 11:33 PM, vw_van_fan_Mark <madvws@cox.net> wrote: >> None of the grounds up under the dash have anything to do with whether >> the van runs or not. There is a key-on power black wire that goes from >> the dash area back to the engine compartment and that wire plays a >> critical role. On most vans the black wire goes to the ignition coil to >> power it and to turn on the ECU power relay as well as enable the fuel >> pump relay. So check for 12 volt power at the coil when key is on. Since >> it is an 86 the exact wiring path can vary. But since this may have >> started with work done on the alternator it would be wise to check for >> constant power on that stud in the engine wiring box. When you get back >> to the van with a meter I'd be willing to help you check things out. >> >> There is a wiring tool you build to bypass a lot of the known failure >> areas that can keep a van from starting. >> >> http://www.thesamba.com/vw/forum/viewtopic.php?t=349429&highlight=wiring+bypass >> >> Mark >> >> >> Cary Chiang wrote: >>> >>> I'm trying to help a first-time vanagon owner get his van running. >>> It's an '86, with 2.1L and manual trans. I was told that the van was >>> being >>> driven almost daily, had some sort of alternator problem, and then failed >>> to start one day. A mechanic diagnosed that the spark plugs weren't >>> firing, but a lack of money prevented any further work. I noticed that >>> the >>> ignition switch was functioning poorly, and temporarily swapped in a good >>> used one. Next, I noticed that the fuel pump wasn't energizing when the >>> ignition key was turned to the accessory position. I ran power directly >>> to >>> the fuel pump to get it running, but the engine still won't start (I'm >>> assuming because of no spark from the plugs). I'm assuming that there >>> is an electrical issue that is affecting both the fuel pump and the >>> ignition system. >>> I've cleaned up the two >>> multi-pronged ground connections above the fuse block, and replaced the >>> ECU, but am running out of easy ideas. I plan to go back with a >>> multi-meter, and check for voltage at the fuse block and at the terminal >>> in >>> the engine compartment black box. Hopefully I will have access to a >>> Bentley also, but my schematic-reading and Vanagon diagnosing skills are >>> pretty rusty. Any idieas and suggestions as to additional components, >>> grounds, or >>> voltages that I should check would be appreciated. Thanks in advance! >>> >> |
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