 L-Jet Relay Board Question, Using I and IV to bump the starter ? |
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| jim_hoyland |
 Jun 17 2012, 11:33 AM
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#1
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Get that VIN ?  Group: Members Posts: 9,319 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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The L-Jet doesn't use the 4 wire connector at the rear of the relay board. like the picture below A yellow wire from the dual relay attaches to II or IV ( they are linked ).
Spade I is hot when the key is on; but it's not used on the L-Jet. Can I mount a momentary switch between Spade I and Spade IV to bump start the engine. I think Clay Perrine brought this up once upon a time. Attached image(s) 
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Replies(1 - 4)
| Mike Bellis |
Jun 17 2012, 11:46 AM
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#2
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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Looks like it will work to me on terminal 2 (II)
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| Dave_Darling |
Jun 17 2012, 12:38 PM
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#3
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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It should work, but you will want to make sure that the wires that feed power to pin I can handle the current that it takes to trigger the starter.
--DD |
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| Tom |
Jun 17 2012, 12:44 PM
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#4
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Advanced Member Group: Members Posts: 2,139 Joined: 21-August 05 From: Port Orchard, WA 98367 Member No.: 4,626 Region Association: None |
Jim,
While that would work electrically, the high currrent may be too much for the power relay. ? Not sure of the current rating on these relays for the relay board. The relay provides the power to #1 of the 4 pin socket. According to Haynes, the pullin current for the starter solenoid is 35 amps, hold in is 11 amps. That was the reason I used a 50 amp relay for the bump/hot start setup on mine. The current to drive the relay I used is 135-150 miliamps. Also using this as a bump feature without a relay using low current will accelerate wear on the switch contacts due to the inductive spike. That is what the diodes are for on the one I made up. Usually, relay contacts are made from a different material that handles inductive spike better than switch contacts. Tom |
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| jim_hoyland |
Jun 17 2012, 02:20 PM
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#5
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Get that VIN ? Group: Members Posts: 9,319 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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QUOTE(Tom @ Jun 17 2012, 11:44 AM)  Jim, While that would work electrically, the high currrent may be too much for the power relay. ? Not sure of the current rating on these relays for the relay board. The relay provides the power to #1 of the 4 pin socket. According to Haynes, the pullin current for the starter solenoid is 35 amps, hold in is 11 amps. That was the reason I used a 50 amp relay for the bump/hot start setup on mine. The current to drive the relay I used is 135-150 miliamps. Also using this as a bump feature without a relay using low current will accelerate wear on the switch contacts due to the inductive spike. That is what the diodes are for on the one I made up. Usually, relay contacts are made from a different material that handles inductive spike better than switch contacts. Tom Thanks for the heads up, I see what you mean. |
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