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05-02-2020, 10:48 AM | #1 |
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Saturday morning electrical questions
I'm not too smart about electrical matters, so here goes. I bought an interesting electronic tach for my diesel conversion. It has a transducer that attaches to an injector line for it's signal. (Tiny Tach) The instructions suggest it should be wired to the radio circuit, or any circuit that isn't activated while starting, because of surges. Do we have such a circuit on our old fords? (47 truck)... Or how can I create one? Next I have a pair of 12v wiper motors from speedway that look to be a good fit under dash to replace the vacuum wipers. Diesels don't create a vacuum. They have a built in switch, which cannot be reached under the dash. I intend to leave them switched on and switch the wire to them. They also want a 2amp fuse. I assume I'll switch the hot wire, not the ground, but which side of the fuse? Does it matter? And would I jump wire the two wiper motors together? I'll check back later this afternoon as my 92 f350 is up on a friend's lift so we can swap out the grenaded rear axle\. Thanks in advance.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
05-02-2020, 11:06 AM | #2 |
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Re: Saturday morning electrical questions
I’d wire the wiper motor with the switch between the fuse and the motor. Wiring them together would depend on whether or not the wipers “self park”. The tach could be powered through a switch so you know there would be no draw at start up..... Mark
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05-02-2020, 09:28 PM | #3 |
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Re: Saturday morning electrical questions
Thank you Mark! Well both solutions seem right on and since nobody chimed in to contradict you, I'll get on these projects right away. I don't see why I'm always having drivetrain problems with my 92. but we got the junkyard sterling 10 1/4 rear in it today . It lives a pretty easy life most of the time at least....
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
05-02-2020, 11:14 PM | #4 | |
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Re: Saturday morning electrical questions
Quote:
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05-02-2020, 11:54 PM | #5 | |
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Re: Saturday morning electrical questions
Quote:
Wiring diagrams are easily available. I don't know how to post one but I'll go look up the number for each pin of the relay and get back. Last edited by 40 Deluxe; 05-03-2020 at 11:30 AM. |
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05-03-2020, 12:14 AM | #6 | |
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Re: Saturday morning electrical questions
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Quote:
Note that presently your tach wire is one piece going from the tach sensor to tach. You simply cut this wire and connect one end to #30 and the other end to #87A. If you do a search for "5 pin relay wiring diagram" you'll find lots of them, some helpful, some not! |
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05-03-2020, 10:42 AM | #7 | |
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Re: Saturday morning electrical questions
Quote:
__________________
Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) Last edited by GB SISSON; 05-03-2020 at 11:24 AM. |
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05-03-2020, 11:45 AM | #8 |
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Re: Saturday morning electrical questions
If your relays have the Bosch numbering system stamped by each terminal, they should work. The ACC terminal may work, too.
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05-03-2020, 01:12 PM | #9 |
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Re: Saturday morning electrical questions
Yes, they are bosch clones with all the same numbers. They are pre-wired with pig tails running off a snap together plug which has a blue, double lipped silicone rubber seal at the connection. They came in a pack of 5 for 26 bucks, free shipping. How do they do that? I guess I should try the acc terminal first though.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
05-03-2020, 11:58 PM | #10 |
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Re: Saturday morning electrical questions
The ACC terminal was off while cranking and on when engine running, so I went the easy way with less connections. Tach is pretty neat item and works well. I started on the wipers, but didn't get done today. Thanks all.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
05-04-2020, 09:34 AM | #11 |
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Re: Saturday morning electrical questions
I like that relay method.....a lot better than my “backyard” switch idea.....if you come up with that eBay link to the 5-pack of those relays, I’d like to get some....thanks.....Mark
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I'm thinkin' about crankin' My ragged ol' truck up and haulin' myself into town. Billy Joe Shaver |
05-04-2020, 12:28 PM | #12 |
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Re: Saturday morning electrical questions
One thing to keep in mind if you are using relays on a 6v positive ground system is that some of them contain a diode so you need to keep the polarity correct. I did this diagram up for a fuel pump, but it applies to about anything.
Last edited by JSeery; 05-04-2020 at 08:33 PM. |
05-04-2020, 07:34 PM | #13 | |
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Re: Saturday morning electrical questions
Quote:
Excellent info! Thanks for sharing |
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05-04-2020, 09:21 PM | #14 |
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Re: Saturday morning electrical questions
They were on amazon from a company called Irhapsody 5 pin relays.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
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